{"title":"Cardinalfish","description":"\u003cp\u003eCardinalfish are popular for their elegant profiles, prominent eyes, and calm hovering behavior. Species differ in social structure, adult size, preferred habitat, and willingness to coexist in groups.\u003c\/p\u003e\u003cp\u003eExplore our current selection or discover more \u003ca href=\"\/collections\/saltwater-fish\"\u003esaltwater fish\u003c\/a\u003e for established aquariums.\u003c\/p\u003e","products":[{"product_id":"pajama-cardinalfish","title":"Pajama Cardinal","description":"\u003cp\u003eThe Pajama Cardinalfish (\u003cem\u003eSphaeramia nematoptera\u003c\/em\u003e) is a distinctive saltwater fish known for its unusual patchwork coloration and calm, hovering behavior. Its yellow-green face is highlighted by vivid red eyes, while a broad dark vertical band separates the front of the body from a pale silver posterior covered in reddish-purple spots. Long fins and a deep, compressed body give this peaceful cardinalfish an unmistakable appearance in a marine aquarium.\u003c\/p\u003e\n\u003cp\u003eNative to the Indo-Pacific, the Pajama Cardinalfish ranges from Java east to Fiji, north to the Ryukyu Islands, and south to the Great Barrier Reef. It inhabits sheltered lagoons and bays, commonly forming loose aggregations among branching corals during daylight hours before dispersing to feed after dark.\u003c\/p\u003e\n\u003cp\u003eReaching approximately 3.5 inches as an adult, this species is well suited to peaceful reef aquariums and community fish-only systems. Its manageable size, reef-safe behavior, and willingness to accept common aquarium foods make it an excellent choice for aquarists seeking a colorful, relatively undemanding marine fish.\u003c\/p\u003e\n\u003ch2\u003eQuick Care Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCare Level:\u003c\/strong\u003e Easy\u003cbr\u003e\u003cstrong\u003eMinimum Tank Size:\u003c\/strong\u003e 30 gallons\u003cbr\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e Peaceful\u003cbr\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e Carnivore \/ Planktivore\u003cbr\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e Yes\u003cbr\u003e\u003cstrong\u003eRegion:\u003c\/strong\u003e Indo-Pacific\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eSphaeramia nematoptera\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide a mature saltwater aquarium with plenty of rockwork, caves, overhangs, and branching structures where the Pajama Cardinalfish can retreat during the day. Open areas should also be available for hovering and nighttime feeding activity.\u003c\/p\u003e\n\u003cp\u003eModerate, varied water movement is appropriate, although calmer areas around caves and rock structures are beneficial. This species naturally occupies relatively sheltered reef environments and does not require intense directional flow.\u003c\/p\u003e\n\u003cp\u003eNo specialized substrate is necessary. A sand-bottom reef aquarium with live rock provides a natural setting, but the species can also thrive in appropriately maintained bare-bottom systems.\u003c\/p\u003e\n\u003cp\u003eA secure aquarium cover is recommended, particularly during acclimation or when territorial interactions occur.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe Pajama Cardinalfish is primarily a carnivorous planktivore that feeds on small crustaceans and other zooplankton.\u003c\/p\u003e\n\u003cp\u003eIn captivity, offer mysis shrimp, enriched brine shrimp, copepods, finely chopped marine seafood, small krill, and quality frozen plankton blends. Appropriately sized marine pellets may also be accepted once the fish is established.\u003c\/p\u003e\n\u003cp\u003eFeed once or twice daily. Because this species naturally becomes more active around dusk and after dark, shy specimens may feed more confidently when food is offered during lower-light periods.\u003c\/p\u003e\n\u003cp\u003eWhen keeping a group, distribute food across several areas of the aquarium to ensure less dominant individuals receive adequate nutrition.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003ePajama Cardinalfish are peaceful and generally well suited to community marine aquariums. They spend much of the day hovering close to shelter rather than actively defending large territories.\u003c\/p\u003e\n\u003cp\u003eThey can be maintained singly, as a compatible pair, or in a small group when sufficient space and hiding areas are available. Although they naturally form aggregations, aquarium groups may develop a social hierarchy, and weaker individuals should be monitored for persistent chasing or exclusion.\u003c\/p\u003e\n\u003cp\u003eSuitable tankmates include peaceful clownfish, gobies, blennies, firefish, small wrasses, peaceful angelfish, and other community-oriented marine species.\u003c\/p\u003e\n\u003cp\u003eAvoid large predatory fish and highly aggressive species that may intimidate or consume them.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Pajama Cardinalfish is \u003cstrong\u003ereef safe\u003c\/strong\u003e and does not normally damage corals, clams, or ornamental reef invertebrates.\u003c\/p\u003e\n\u003cp\u003eIt commonly hovers among branching corals and rockwork without feeding on the coral itself. Adult ornamental shrimp, snails, hermit crabs, and other typical reef-cleanup animals are generally compatible.\u003c\/p\u003e\n\u003cp\u003eVery tiny crustaceans and planktonic organisms may be consumed as part of the fish's natural feeding behavior, but this does not prevent it from being an excellent choice for conventional reef aquariums.\u003c\/p\u003e\n\u003ch2\u003eWater Parameters\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature:\u003c\/strong\u003e 75–80°F\u003cbr\u003e\u003cstrong\u003eSpecific Gravity:\u003c\/strong\u003e 1.024–1.026\u003cbr\u003e\u003cstrong\u003epH:\u003c\/strong\u003e 8.1–8.4\u003cbr\u003e\u003cstrong\u003eAlkalinity:\u003c\/strong\u003e 8–12 dKH\u003c\/p\u003e\n\u003cp\u003eStable temperature, salinity, and overall water quality are more important than continually adjusting the aquarium to reach exact numbers. Consistent maintenance and adequate oxygenation will support long-term health.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGroup dynamics:\u003c\/strong\u003e Pajama Cardinalfish can be kept in groups, but social hierarchies may develop and subordinate individuals should be monitored.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNocturnal tendencies:\u003c\/strong\u003e This species becomes more active during evening and nighttime hours and may initially prefer feeding under subdued lighting.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdult size:\u003c\/strong\u003e Adults reach approximately 3.5 inches and require adequate shelter and swimming room despite their relatively sedentary behavior.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePeaceful temperament:\u003c\/strong\u003e Avoid highly aggressive or predatory tankmates that may intimidate or consume this relatively calm species.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReef compatibility:\u003c\/strong\u003e Corals and typical ornamental reef invertebrates are generally left undisturbed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePajama Cardinalfish (Sphaeramia nematoptera)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Pajama Cardinalfish is a peaceful, nocturnal reef fish with a quirky and unmistakable appearance. Its body features a greenish-yellow face, a bold red eye, and a midsection marked by a black vertical band, followed by a speckled rear half covered in red-orange polka dots—resembling a pair of colorful pajamas. Calm and easygoing, this species is a favorite for both beginner and experienced aquarists.\u003c\/p\u003e\n\u003ch3\u003eTank Requirements\u003c\/h3\u003e\n\u003cp\u003ePajama Cardinals do well in tanks of 30 gallons or more, with moderate flow and ample rockwork to provide hiding spots and shaded areas. As schooling fish, they are best kept in small groups (3 or more) to encourage natural social behavior, but ensure adequate space to prevent bickering within the group. They adapt easily to both reef and fish-only systems.\u003c\/p\u003e\n\u003ch3\u003ePeaceful and Reef-Safe\u003c\/h3\u003e\n\u003cp\u003eThese cardinalfish are completely reef-safe, posing no threat to corals or invertebrates. Their peaceful nature makes them ideal for community aquariums, where they typically keep to themselves or their group. While mostly active at night, they adapt to aquarium lighting schedules and become more visible during the day.\u003c\/p\u003e\n\u003ch3\u003eDiet and Feeding\u003c\/h3\u003e\n\u003cp\u003ePajama Cardinals are carnivorous and easy to feed, readily accepting a wide range of foods. Offer high-quality frozen foods like mysis shrimp, brine shrimp, and finely chopped seafood, along with meaty pellets and flakes. Feedings should be small and frequent, especially in systems with strong competition for food.\u003c\/p\u003e\n\u003ch3\u003eTankmates and Behavior\u003c\/h3\u003e\n\u003cp\u003eNaturally peaceful and slow-moving, Pajama Cardinals are excellent companions for other non-aggressive fish, including gobies, blennies, clownfish, and wrasses. Avoid pairing them with fast, boisterous or aggressive tankmates that may outcompete them at feeding time. In groups, they exhibit mild pecking order behavior but rarely cause real harm. They are also known for hovering motionless in mid-water, adding a calm, mesmerizing dynamic to any tank.\u003c\/p\u003e","brand":"TSA Fish","offers":[{"title":"SM (\u003c2.25\")","offer_id":51051131896106,"sku":"CARDINALxPajamaSM","price":42.99,"currency_code":"USD","in_stock":false},{"title":"Large (2.25\"+)","offer_id":51061860204842,"sku":"CARDINALxPajamaL","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/PajamaCardinal.png?v=1789579024"},{"product_id":"captive-bred-banggai-cardinalfish","title":"Captive-Bred Banggai Cardinalfish","description":"\u003cp\u003eThe Captive-Bred Banggai Cardinalfish is an elegant saltwater fish with a metallic silver body, three bold black vertical bands, and delicate white spotting across its elongated fins. Tall dorsal spines, trailing pelvic fins, and a deeply forked tail create a distinctive silhouette that looks especially dramatic beneath reef aquarium lighting.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePterapogon kauderni\u003c\/em\u003e is naturally restricted to shallow coastal habitats around the Banggai Archipelago of Central Sulawesi, Indonesia. Wild fish hover near seagrass, coral structures, anemones, and long-spined sea urchins, retreating into protective cover when threatened. Adults reach approximately 3.4 inches in total length. \u003c\/p\u003e\n\u003cp\u003eCaptive-bred specimens are the preferred choice for marine aquariums because they support established aquaculture rather than direct collection from the species’ limited wild range. Banggai Cardinalfish reproduce successfully in captivity, while wild populations remain listed as threatened under the U.S. Endangered Species Act and endangered by the IUCN. \u003c\/p\u003e\n\u003ch2\u003eQuick Care Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCare Level:\u003c\/strong\u003e Easy\u003cbr\u003e\u003cstrong\u003eMinimum Tank Size:\u003c\/strong\u003e 30 gallons\u003cbr\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e Peaceful\u003cbr\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e Carnivore \/ Planktivore\u003cbr\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e Yes\u003cbr\u003e\u003cstrong\u003eRegion:\u003c\/strong\u003e Captive-bred; species endemic to the Banggai Archipelago, Indonesia\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003ePterapogon kauderni\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe species reaches approximately 3.4 inches and is commonly maintained in aquariums of 30 gallons or larger. \u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide a stable, established aquarium with live rock arranged into caves, ledges, overhangs, and sheltered hovering areas. Banggai Cardinalfish are not constant open-water swimmers and often remain close to a preferred structure while watching for passing food.\u003c\/p\u003e\n\u003cp\u003eLeave some open space through the middle of the aquarium, but include several visual barriers and protected retreats. Branching rockwork or other complex structures can help replicate the shelter naturally provided by coral colonies, anemones, seagrass, and long-spined sea urchins. A live urchin or host anemone is not required. \u003c\/p\u003e\n\u003cp\u003eA sand or fine-gravel substrate is suitable, although there is no specialized substrate requirement. Gentle to moderate, well-distributed water movement works best, with calmer areas where the fish can hover without continually fighting strong flow. Use a fitted lid or mesh cover as a precaution against jumping when startled.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe Banggai Cardinalfish is a carnivorous planktivore that naturally consumes small planktonic and bottom-dwelling crustaceans. Offer appropriately sized foods that drift slowly through the water column, allowing the fish to feed from its preferred hovering position. \u003c\/p\u003e\n\u003cp\u003eSuitable foods include mysis shrimp, enriched brine shrimp, copepods, calanus, finely chopped krill, shrimp or clam, frozen marine carnivore blends, and small slow-sinking pellets. Captive-bred specimens generally adapt well to a varied prepared diet, but individuals should still be observed to confirm they are receiving enough food. \u003c\/p\u003e\n\u003cp\u003eFeed one or two small portions daily. An early morning or evening feeding can complement the species’ natural tendency to feed during lower-light periods. Avoid housing it with excessively fast or aggressive feeders that consume all available food before the cardinalfish can respond.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eThis species is peaceful toward most unrelated marine fish and is well suited to calm community aquariums. Appropriate tankmates include clownfish, gobies, blennies, firefish, peaceful wrasses, assessors, and other non-predatory species that will not intimidate it at feeding time.\u003c\/p\u003e\n\u003cp\u003eKeep a single specimen or a confirmed compatible pair in most aquariums. Juveniles may appear comfortable in groups, but mature fish can become territorial toward their own species, particularly after a breeding pair forms. Groups should only be attempted in substantially larger aquariums with numerous separated retreats and careful observation. \u003c\/p\u003e\n\u003cp\u003eBanggai Cardinalfish are paternal mouthbrooders. After spawning, the male carries the developing eggs and young in his mouth and may reduce or stop feeding during the brooding period. \u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Captive-Bred Banggai Cardinalfish is \u003cstrong\u003ereef safe\u003c\/strong\u003e. It does not normally damage healthy stony corals, soft corals, zoanthids, anemones, clams, snails, or other sessile reef inhabitants.\u003c\/p\u003e\n\u003cp\u003eEstablished ornamental shrimp are generally compatible, although very small shrimp, fish fry, copepods, amphipods, and other tiny crustaceans may be consumed as natural prey. Its calm hovering behavior makes it particularly suitable for coral-focused reef aquarium displays.\u003c\/p\u003e\n\u003ch2\u003eWater Parameters\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature:\u003c\/strong\u003e 75–80°F\u003cbr\u003e\u003cstrong\u003eSpecific Gravity:\u003c\/strong\u003e 1.024–1.026\u003cbr\u003e\u003cstrong\u003epH:\u003c\/strong\u003e 8.1–8.4\u003cbr\u003e\u003cstrong\u003eAlkalinity:\u003c\/strong\u003e 8–12 dKH\u003c\/p\u003e\n\u003cp\u003eMaintain consistent salinity, good oxygenation, and dependable biological filtration. Stability is more important than repeatedly adjusting the aquarium to reach one exact measurement.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eKeep singly or as a compatible pair:\u003c\/strong\u003e Adult conspecifics may become aggressive after pairing or establishing territories.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChoose calm tankmates:\u003c\/strong\u003e Boisterous fish can intimidate this slow, deliberate feeder.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProvide sheltered hovering areas:\u003c\/strong\u003e Caves, ledges, and branching structures help the fish feel secure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMonitor mouthbrooding males:\u003c\/strong\u003e A brooding male may refuse food while carrying eggs and developing young.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProtect very small animals:\u003c\/strong\u003e Tiny shrimp, crustaceans, and fish fry may be viewed as prey.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"SM (\u003c1.75\")","offer_id":50812189016362,"sku":"CARDINALxBangCBSM","price":39.99,"currency_code":"USD","in_stock":false},{"title":"Large (1.75\"+)","offer_id":50812189081898,"sku":"CARDINALxBangCBL","price":52.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/tsa-fish-captive-bred-banggai-cardinalfish-1257022762.png?v=1790974005"},{"product_id":"flower-cardinalfish-apogon-fleurieu","title":"Flower Cardinalfish","description":"\u003cp\u003eThe Flower Cardinalfish is an attractive Indo-Pacific cardinalfish with an iridescent copper, orange, and dusky-pink body, electric blue facial lines, and a distinctive dark marking at the base of the tail. Adults develop a broad black caudal-peduncle bar, while juveniles typically show a more rounded dark spot in the same area. Its large eyes and reflective coloration are characteristic of cardinalfishes adapted to feeding during lower-light periods.\u003c\/p\u003e\n\u003cp\u003eOften sold in the aquarium trade as \u003cem\u003eApogon fleurieu\u003c\/em\u003e, the currently accepted name is \u003cem\u003eOstorhinchus fleurieu\u003c\/em\u003e. The species has a broad Indo-West Pacific distribution extending from the Red Sea and Persian Gulf through East Africa, the Indian Ocean and Indo-Malayan region to Hong Kong, Australia, and Fiji. In nature, Flower Cardinalfish inhabit shallow coral reefs with moderate currents and commonly shelter together in crevices during the day.\u003c\/p\u003e\n\u003cp\u003ePeaceful behavior, manageable adult size, and compatibility with corals make this marine aquarium fish an appealing addition to established reef aquariums and peaceful fish-only systems. It is especially attractive when maintained in an aquarium with shaded caves and overhangs that allow its natural sheltering behavior.\u003c\/p\u003e\n\u003ch2\u003eQuick Care Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCare Level:\u003c\/strong\u003e Moderate\u003cbr\u003e\u003cstrong\u003eMinimum Tank Size:\u003c\/strong\u003e 40 gallons\u003cbr\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e Peaceful\u003cbr\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e Carnivore \/ Planktivore\u003cbr\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e With Caution\u003cbr\u003e\u003cstrong\u003eRegion:\u003c\/strong\u003e Indo-West Pacific – Red Sea and Persian Gulf through the Indian Ocean, Southeast Asia, Australia, and Fiji\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eOstorhinchus fleurieu\u003c\/em\u003e (syn. \u003cem\u003eApogon fleurieu\u003c\/em\u003e)\u003c\/p\u003e\n\u003cp\u003eAdults can reach approximately 14.2 cm, or about 5.6 inches, in total length.\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide the Flower Cardinalfish with a mature saltwater aquarium containing plenty of live rock, caves, ledges, and shaded crevices. In the wild, this species commonly forms small schools and retreats into reef structure for shelter, so an aquascape with multiple protected areas helps encourage natural behavior and reduces stress.\u003c\/p\u003e\n\u003cp\u003eLeave open swimming space around the rockwork, particularly if maintaining more than one specimen. Moderate reef-style circulation is appropriate and reflects the moderately current-swept reef habitats where the species is commonly encountered.\u003c\/p\u003e\n\u003cp\u003eNo specialized substrate is required. A secure aquarium cover is recommended, particularly during acclimation or when the fish is startled.\u003c\/p\u003e\n\u003cp\u003eLarger aquariums are preferable when keeping a group because they provide additional shelter, feeding space, and room for individuals or pairs to establish comfortable spacing.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe Flower Cardinalfish is a carnivorous planktivore that feeds primarily on zooplankton and small crustaceans. In captivity, provide appropriately sized, protein-rich marine foods such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eFrozen mysis shrimp\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnriched brine shrimp\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCopepods\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCalanus and other zooplankton-based foods\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFinely chopped shrimp or marine seafood\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSmall high-quality carnivore pellets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFrozen marine plankton blends\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMultiple small feedings are beneficial, particularly for newly introduced specimens. Aquarium husbandry references recommend small meaty foods and frequent feeding because this species naturally consumes small prey items rather than large meals.\u003c\/p\u003e\n\u003cp\u003eNew arrivals may initially be more comfortable feeding under subdued lighting or close to rockwork. Once acclimated, many individuals become more willing to enter open water during feeding.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eThe Flower Cardinalfish is generally \u003cstrong\u003epeaceful\u003c\/strong\u003e and is best paired with similarly non-aggressive marine aquarium fish. Suitable companions include peaceful clownfish, gobies, blennies, firefish, smaller wrasses, peaceful anthias, and other community-oriented reef species.\u003c\/p\u003e\n\u003cp\u003eIn nature, adults are frequently observed in small schools composed of pairs, and the species forms distinct pairs during courtship and spawning. Males are mouthbrooders.\u003c\/p\u003e\n\u003cp\u003eSingle specimens can be maintained successfully, but pairs or carefully introduced groups can provide more natural social behavior when adequate aquarium space and shelter are available. As groups mature, monitor individuals for exclusion or persistent chasing, particularly if pairs begin forming.\u003c\/p\u003e\n\u003cp\u003eAvoid housing them with large predatory fish or highly aggressive tankmates that may intimidate these relatively reserved cardinalfish.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Flower Cardinalfish is highly compatible with corals and does not normally damage SPS, LPS, soft corals, zoanthids, or clams. Aquarium husbandry references generally classify the species as reef safe.\u003c\/p\u003e\n\u003cp\u003eIt is best labeled \u003cstrong\u003ereef safe with caution\u003c\/strong\u003e, however, because it is a carnivorous predator of small crustaceans and zooplankton. Extremely small ornamental shrimp, newly released shrimp larvae, tiny crustaceans, and other appropriately sized reef microfauna may be eaten.\u003c\/p\u003e\n\u003cp\u003eEstablished larger ornamental shrimp, snails, hermit crabs, and similar cleanup-crew animals are generally much less likely to be viewed as prey.\u003c\/p\u003e\n\u003ch2\u003eWater Parameters\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature:\u003c\/strong\u003e 75–80°F\u003cbr\u003e\u003cstrong\u003eSpecific Gravity:\u003c\/strong\u003e 1.024–1.026\u003cbr\u003e\u003cstrong\u003epH:\u003c\/strong\u003e 8.1–8.4\u003cbr\u003e\u003cstrong\u003eAlkalinity:\u003c\/strong\u003e 8–12 dKH\u003c\/p\u003e\n\u003cp\u003eStable conditions and consistent water quality are more important than continually adjusting the aquarium to achieve one exact value within these ranges.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdult size:\u003c\/strong\u003e Flower Cardinalfish can reach approximately 5.6 inches in total length and should be housed according to its mature size rather than its size at purchase.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProvide shaded shelter:\u003c\/strong\u003e Caves, overhangs, and crevices allow the fish to display its natural daytime sheltering behavior.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSocial behavior:\u003c\/strong\u003e Wild adults commonly occur in small schools and form pairs, making additional aquarium space useful when maintaining several specimens.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFeed small meaty foods:\u003c\/strong\u003e Mysis, copepods, enriched brine shrimp, and other plankton-sized foods are ideal staples, especially during acclimation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTaxonomy:\u003c\/strong\u003e Although still widely sold as \u003cem\u003eApogon fleurieu\u003c\/em\u003e, the currently accepted scientific name is \u003cem\u003eOstorhinchus fleurieu\u003c\/em\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"Default Title","offer_id":51285917008170,"sku":"CARDINALxFlower","price":49.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/tsa-fish-flower-cardinalfish-1257022767.png?v=1790971152"}],"url":"https:\/\/topshelfaquatics.com\/collections\/cardinalfish.oembed","provider":"Top Shelf Aquatics","version":"1.0","type":"link"}