{"product_id":"blue-line-angelfish-chaetodontoplus-septentrionalis","title":"Blue Line Angelfish - Chaetodontoplus septentrionalis","description":"\u003cp\u003eThe Blue Line Angelfish (\u003cem\u003eChaetodontoplus septentrionalis\u003c\/em\u003e), also known as the Bluestriped Angelfish, is a distinctive marine angelfish recognized by its warm yellow-to-tan body crossed with vivid electric-blue horizontal lines. Brilliant blue markings continue across the head and fins, while the yellow tail adds even more contrast. Its unusual pattern and somewhat elongated adult profile give this species a very different appearance from the larger \u003cem\u003ePomacanthus\u003c\/em\u003e angelfish commonly seen in saltwater aquariums.\u003c\/p\u003e\n\u003cp\u003eNative to the western Pacific, the Blue Line Angelfish ranges from the Malay Peninsula northward to southern Japan and inhabits coastal rocky and coral reefs. Adults are generally solitary in the wild and feed heavily on sponges and tunicates growing across reef surfaces. The species reaches approximately 8.7 inches in total length.\u003c\/p\u003e\n\u003cp\u003eFor aquarists with a large, mature marine aquarium, the Blue Line Angelfish can become a spectacular centerpiece. It is an active, intelligent fish that may initially be shy but typically becomes much more confident once established. Because it can become territorial and has a strong tendency to investigate corals and sessile invertebrates, it is best suited to a fish-only or fish-only-with-live-rock aquarium rather than a traditional reef aquarium.\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 180 gallons\u003cbr\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e Semi-aggressive\u003cbr\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e Omnivore\u003cbr\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e No\u003cbr\u003e\u003cstrong\u003eRegion:\u003c\/strong\u003e Western Pacific — Malay Peninsula northward to southern Japan\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eChaetodontoplus septentrionalis\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eAdults reach approximately 22 cm, or 8.7 inches, and are active swimmers that benefit from substantial swimming room and established territories.\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide a mature aquarium with extensive live rock arranged into caves, overhangs, and sheltered areas. Blue Line Angelfish naturally inhabit coastal rocky and coral reefs, and newly introduced specimens often appreciate secure retreats until they become comfortable with their surroundings.\u003c\/p\u003e\n\u003cp\u003eRockwork should offer plenty of grazing surfaces and visual barriers without eliminating open swimming space. This is an active angelfish, so a long aquarium with a generous footprint is strongly preferred for permanent housing.\u003c\/p\u003e\n\u003cp\u003eGood oxygenation, efficient protein skimming, and consistent filtration are important, particularly because the species benefits from several smaller feedings throughout the day. A specialized substrate is not required. Keep the aquarium securely covered as a general precaution with active marine fish.\u003c\/p\u003e\n\u003cp\u003eThis species also comes from cooler waters than many tropical marine angelfish and generally does best toward the cooler end of typical saltwater aquarium temperatures.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eIn the wild, the Blue Line Angelfish feeds primarily on sponges and tunicates, making dietary variety especially important in captivity.\u003c\/p\u003e\n\u003cp\u003eOffer high-quality marine angelfish preparations containing sponge material along with mysis shrimp, enriched brine shrimp, chopped clam, mussel, shrimp, squid, and quality frozen marine blends. Spirulina-based foods and marine algae sheets can also be offered to provide additional vegetable matter and dietary variety.\u003c\/p\u003e\n\u003cp\u003eFeed several smaller meals throughout the day when practical. Three smaller feedings per day is a good target for established specimens, with more frequent offerings helpful during initial acclimation. Mature live rock that supports natural grazing can also help the fish settle into captivity.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eThe Blue Line Angelfish is semi-aggressive and can become noticeably more territorial after becoming established. Adults may challenge other angelfish as well as similarly shaped fish that compete for grazing areas.\u003c\/p\u003e\n\u003cp\u003eIt is generally best maintained as the only Blue Line Angelfish unless a compatible male-female pair is being kept in a very large, carefully managed aquarium. Avoid casually mixing it with other \u003cem\u003eChaetodontoplus\u003c\/em\u003e species or similarly shaped angelfish in confined spaces.\u003c\/p\u003e\n\u003cp\u003eSuitable tankmates include appropriately sized tangs, rabbitfish, wrasses, hawkfish, larger damsels, and other robust marine fish that will not be easily intimidated. When mixing it with other assertive species, abundant rockwork and visual barriers become especially important.\u003c\/p\u003e\n\u003cp\u003eWhenever possible, introduce a larger or established Blue Line Angelfish after more peaceful tankmates have settled into the aquarium, as established adults can become dominant members of the community.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Blue Line Angelfish is not considered reliably reef safe.\u003c\/strong\u003e Its natural feeding behavior involves picking at encrusting organisms such as sponges and tunicates, and captive specimens may also nip a variety of sessile invertebrates.\u003c\/p\u003e\n\u003cp\u003eFleshy LPS corals, soft corals, zoanthids, tubeworms, and clam mantles are particularly at risk. SPS corals may sometimes receive less attention, but individual behavior varies and no coral should be assumed completely safe. Tridacnid clams may also be repeatedly picked at and damaged.\u003c\/p\u003e\n\u003cp\u003eFor aquarists who want predictable coral and invertebrate compatibility, this species is better suited to a fish-only-with-live-rock aquarium.\u003c\/p\u003e\n\u003ch2\u003eWater Parameters\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature:\u003c\/strong\u003e 70–76°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\u003eThe Blue Line Angelfish originates from a range that includes cooler subtropical waters and generally benefits from temperatures below those commonly maintained for many tropical reef aquariums. Published aquarium references recommend keeping this species toward the cooler end of the marine aquarium range.\u003c\/p\u003e\n\u003cp\u003eAs with all marine angelfish, stable temperature, salinity, pH, and excellent water quality are more important than continually adjusting the aquarium to reach an exact number.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNeeds ample swimming room:\u003c\/strong\u003e Although it reaches approximately 8.7 inches rather than the much larger size of many \u003cem\u003ePomacanthus\u003c\/em\u003e angels, it is an active species that benefits from a spacious aquarium.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan become territorial:\u003c\/strong\u003e Established adults may become aggressive toward other angelfish and similarly shaped competitors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMay be shy during acclimation:\u003c\/strong\u003e Provide caves and sheltered rockwork so a newly introduced specimen can retreat until it becomes comfortable.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRequires a varied diet:\u003c\/strong\u003e Sponge-based angelfish foods, marine proteins, algae, and multiple smaller feedings help meet its nutritional requirements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNot reliably reef safe:\u003c\/strong\u003e LPS corals, soft corals, zoanthids, tubeworms, and clams may be picked at or consumed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"Tiny (\u003c2\")","offer_id":52273913921834,"sku":"ANGELxBlueLineT","price":699.99,"currency_code":"USD","in_stock":false},{"title":"Small (2.1-2.5\")","offer_id":52074437640490,"sku":"ANGELxBlueLineS","price":749.99,"currency_code":"USD","in_stock":false},{"title":"SM (2.6-3.5\")","offer_id":51137518403882,"sku":"ANGELxBlueLineSM","price":779.99,"currency_code":"USD","in_stock":false},{"title":"Medium (3.6-4.5\")","offer_id":51289175195946,"sku":"ANGELxBlueLineM","price":824.99,"currency_code":"USD","in_stock":false},{"title":"ML (4.6-5.5\")","offer_id":52074437673258,"sku":"ANGELxBlueLineML","price":899.99,"currency_code":"USD","in_stock":false},{"title":"Large (5.6-6.5\")","offer_id":52074437706026,"sku":"ANGELxBlueLineL","price":974.99,"currency_code":"USD","in_stock":false},{"title":"XL (6.6-7.5\")","offer_id":52074437738794,"sku":"ANGELxBlueLineXL","price":1079.99,"currency_code":"USD","in_stock":false},{"title":"XX (7.6-8.5\")","offer_id":52074437771562,"sku":"ANGELxBlueLineXX","price":1349.99,"currency_code":"USD","in_stock":false},{"title":"SHOW (8.6-10.5\")","offer_id":52074437804330,"sku":"ANGELxBlueLineSH","price":1549.99,"currency_code":"USD","in_stock":false},{"title":"JUMBO (10.6\"+)","offer_id":52074437837098,"sku":"ANGELxBlueLineJ","price":1579.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/BlueLineAngel.png?v=1786984383","url":"https:\/\/topshelfaquatics.com\/products\/blue-line-angelfish-chaetodontoplus-septentrionalis","provider":"Top Shelf Aquatics ","version":"1.0","type":"link"}