{"product_id":"koran-angelfish-juvenile-pomacanthus-semicirculatus","title":"Koran Angelfish - Juvenile - Pomacanthus semicirculatus","description":"\u003cp\u003eThe juvenile Koran Angelfish (\u003cem\u003ePomacanthus semicirculatus\u003c\/em\u003e), also known as the Semicircle Angelfish or Halfcircled Angelfish, is one of the most striking juvenile marine angelfish available. Young specimens have a deep blue-black body covered with brilliant electric-blue and white curved bands that form distinctive semicircular patterns across the sides. As the fish matures, this dramatic juvenile coloration gradually transforms into the yellow-green, brown, and blue-spotted pattern of the adult.\u003c\/p\u003e\n\u003cp\u003eNative to the Indo-West Pacific, the Koran Angelfish has an extensive natural distribution from the Red Sea and East Africa east to Samoa, north to southern Japan, and south to Western Australia and New South Wales. Juveniles are commonly associated with shallow, protected reef habitats, while adults favor coral-rich coastal reefs with substantial structure and shelter.\u003c\/p\u003e\n\u003cp\u003eAlthough juveniles are relatively compact when offered for sale, \u003cem\u003ePomacanthus semicirculatus\u003c\/em\u003e develops into a very large, powerful saltwater fish reaching approximately 15–16 inches. It is best suited to experienced aquarists with a spacious fish-only aquarium or fish-only-with-live-rock system. Its bold appearance, substantial adult presence, and dramatic color transformation make it a particularly rewarding centerpiece fish when long-term housing requirements are planned from the beginning.\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 250 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 Indo-West Pacific – Red Sea and East Africa to Samoa, north to southern Japan, south to Western Australia and New South Wales\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003ePomacanthus semicirculatus\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eThe Koran Angelfish requires a mature aquarium of at least 250 gallons to accommodate its substantial adult size and territorial nature. Adults can reach approximately 15–16 inches, so long-term housing should provide both generous swimming room and extensive rockwork.\u003c\/p\u003e\n\u003cp\u003eArrange large, stable rock structures to create caves, overhangs, passages, and sheltered resting areas while preserving broad open spaces for swimming. Established live rock is particularly beneficial because it provides additional grazing surfaces and helps create the complex reef environment this species naturally explores throughout the day.\u003c\/p\u003e\n\u003cp\u003eStrong biological filtration, efficient protein skimming, good oxygenation, and moderate to strong water circulation are recommended. Large angelfish produce a significant biological load as they mature, making adequate filtration and nutrient export especially important.\u003c\/p\u003e\n\u003cp\u003eThe aquascape should also be planned with adult body size in mind. Narrow gaps that easily accommodate a juvenile may become unusable as the fish develops its deep-bodied adult form.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe Koran Angelfish is an omnivore that naturally feeds on sponges, tunicates, algae, and other reef-associated material. A diverse captive diet is important for proper growth, coloration, and long-term condition.\u003c\/p\u003e\n\u003cp\u003eOffer high-quality marine angelfish preparations containing sponge material, Spirulina-based foods, marine algae sheets, mysis shrimp, enriched brine shrimp, chopped shrimp, clam, squid, and balanced frozen marine blends. Quality pellets can also be incorporated once readily accepted.\u003c\/p\u003e\n\u003cp\u003eEstablished live rock provides additional grazing opportunities between meals, but it should not replace regular feeding. Offer two to three smaller meals per day when practical, particularly during periods of active juvenile growth.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eThe Koran Angelfish is semi-aggressive and becomes increasingly territorial as it matures. Juveniles may initially appear relatively tolerant of other community fish, but adult behavior and space requirements should always guide long-term stocking decisions.\u003c\/p\u003e\n\u003cp\u003eSuitable tankmates include medium to large, moderately assertive marine fish that are unlikely to be intimidated or easily bullied. Tangs, larger wrasses, rabbitfish, some triggerfish, and other robust fish-only species may be appropriate when aquarium size and individual temperament are considered.\u003c\/p\u003e\n\u003cp\u003eUse caution with other large angelfish, especially similarly shaped \u003cem\u003ePomacanthus\u003c\/em\u003e species. Territorial disputes can become severe as the fish mature. Keeping a single Koran Angelfish is the most straightforward approach for most home aquariums.\u003c\/p\u003e\n\u003cp\u003eVery small, timid, or slow-feeding fish may be poor long-term companions for a dominant adult.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Koran Angelfish is \u003cstrong\u003enot considered reef safe\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eAs it matures, it may nip or consume soft and stony corals, clam mantles, sponges, tunicates, and other sessile invertebrates. This feeding behavior is consistent with its natural diet and should be expected rather than treated as unusual behavior.\u003c\/p\u003e\n\u003cp\u003eOrnamental mobile invertebrates such as larger shrimp, crabs, and snails may sometimes coexist with an individual specimen, but compatibility cannot be guaranteed in a mixed reef environment.\u003c\/p\u003e\n\u003cp\u003eFor predictable long-term housing, a spacious fish-only or fish-only-with-live-rock aquarium is the preferred setup.\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 stable, well-oxygenated seawater and avoid rapid fluctuations in salinity, temperature, pH, or alkalinity. Consistent water quality is more important than continually adjusting parameters 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\u003eMajor color transformation:\u003c\/strong\u003e Juveniles display blue-black bodies with white and electric-blue semicircular bands that gradually change into the very different adult coloration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLarge adult size:\u003c\/strong\u003e This species can reach approximately 15–16 inches and requires substantial swimming space and filtration capacity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIncreasing territoriality:\u003c\/strong\u003e Aggression toward other angelfish and similarly shaped fish can become more pronounced with maturity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNot reef safe:\u003c\/strong\u003e Corals, clams, sponges, tunicates, and other sessile invertebrates may be eaten or persistently nipped.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePlan for the adult from the start:\u003c\/strong\u003e Rockwork, swimming lanes, filtration, and tankmates should all be selected with the fish’s eventual adult size and behavior in mind.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"Tiny (\u003c1.25\")","offer_id":52211785761066,"sku":"ANGELxKoranJT","price":74.99,"currency_code":"USD","in_stock":false},{"title":"Small (1.26-2\")","offer_id":52211785793834,"sku":"ANGELxKoranJS","price":86.99,"currency_code":"USD","in_stock":true},{"title":"SM (2.1-2.5\")","offer_id":52211785826602,"sku":"ANGELxKoranJSM","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Medium (2.6-3\")","offer_id":52211785859370,"sku":"ANGELxKoranJM","price":119.99,"currency_code":"USD","in_stock":true},{"title":"ML (3.1-3.5\")","offer_id":52211785892138,"sku":"ANGELxKoranJML","price":161.99,"currency_code":"USD","in_stock":true},{"title":"Large (3.6-4\")","offer_id":52211785924906,"sku":"ANGELxKoranJL","price":194.99,"currency_code":"USD","in_stock":true},{"title":"XL (4.1-5\")","offer_id":52211785957674,"sku":"ANGELxKoranJXL","price":224.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/KoranAngelJuv_09ba10a7-8687-41cb-ba87-4d0156575521.png?v=1787337830","url":"https:\/\/topshelfaquatics.com\/products\/koran-angelfish-juvenile-pomacanthus-semicirculatus","provider":"Top Shelf Aquatics ","version":"1.0","type":"link"}