{"product_id":"unicorn-whitemargin-tang","title":"Whitemargin Unicornfish","description":"\u003cp\u003eThe Whitemargin Unicorn Tang, \u003cem\u003eNaso annulatus\u003c\/em\u003e, is an enormous and distinctive saltwater fish known for its streamlined body, developing forehead horn, and striking white accents on the tail and fins. Juveniles and subadults are generally brown to olive with a paler underside and a conspicuous white band around the caudal peduncle. As the fish matures, the forehead projection becomes increasingly pronounced, the paired caudal plates become formidable cutting keels, and adults develop a more imposing profile. Mature males may also develop elongated caudal filaments.\u003c\/p\u003e\n\u003cp\u003eNative to a vast portion of the Indo-Pacific, from East Africa across to Hawaii and French Polynesia and north to southern Japan, this species undergoes notable habitat and dietary changes with age. Juveniles are commonly associated with shallow lagoon reefs and graze algae, while large adults move onto deeper outer reef slopes and feed extensively on zooplankton in open water. With an adult length that can approach 39 inches, the Whitemargin Unicorn Tang is an extraordinary marine aquarium fish suitable only for exceptionally large reef aquariums or fish-only displays designed around its tremendous adult size and swimming requirements.\u003c\/p\u003e\n\u003ch2\u003eQuick Care Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCare Level:\u003c\/strong\u003e Expert Only\u003cbr\u003e\u003cstrong\u003eMinimum Tank Size:\u003c\/strong\u003e 750 gallons\u003cbr\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e Semi-aggressive\u003cbr\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e Planktivore \/ Omnivore\u003cbr\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e Yes\u003cbr\u003e\u003cstrong\u003eRegion:\u003c\/strong\u003e Indo-Pacific, from East Africa to Hawaii and French Polynesia, north to southern Japan\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eNaso annulatus\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eThe Whitemargin Unicorn Tang requires an exceptionally large aquarium with extensive uninterrupted swimming space. Adults can approach 39 inches in total length, placing this species well beyond the practical limits of most home aquariums. A system of at least 750 gallons with an aquarium length approaching 10 feet is recommended for appropriate long-term housing.\u003c\/p\u003e\n\u003cp\u003eAquascaping should prioritize open water. Position sturdy rockwork along the rear or sides of the aquarium to create large caves, overhangs, and protected nighttime resting areas without restricting swimming lanes.\u003c\/p\u003e\n\u003cp\u003eModerate to strong water movement, very high oxygenation, substantial biological filtration, and dependable nutrient export are essential. Large adults consume considerable amounts of food and produce a correspondingly significant waste load.\u003c\/p\u003e\n\u003cp\u003eAll rockwork and coral structures should be extremely secure. A mature specimen is a powerful swimmer capable of accidentally displacing inadequately secured aquarium structures.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe natural diet changes significantly as this species matures. Juveniles consume substantial amounts of filamentous algae, while adults increasingly feed on large zooplankton in the water column.\u003c\/p\u003e\n\u003cp\u003eCaptive specimens should receive a varied diet that reflects both feeding strategies. Offer dried marine algae or nori, spirulina-based foods, and quality herbivore pellets alongside mysis shrimp, enriched brine shrimp, krill, copepod-based preparations, and quality frozen plankton blends.\u003c\/p\u003e\n\u003cp\u003eFoods distributed through the water column are particularly appropriate for larger specimens and encourage natural open-water feeding behavior.\u003c\/p\u003e\n\u003cp\u003eFeed multiple smaller meals throughout the day. Marine algae should remain part of the diet even after the fish begins accepting substantial quantities of planktonic and protein-rich foods.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eThe Whitemargin Unicorn Tang is generally manageable with unrelated marine fish but should be considered semi-aggressive because of its tremendous adult size and potential territorial behavior toward other surgeonfish.\u003c\/p\u003e\n\u003cp\u003eAppropriate tankmates include large angelfish, rabbitfish, substantial wrasses, compatible triggerfish, and other robust marine species capable of sharing an exceptionally large aquarium.\u003c\/p\u003e\n\u003cp\u003eParticular caution is required around other \u003cem\u003eNaso\u003c\/em\u003e species and large surgeonfish competing for the same open-water territory. Even relatively mild territorial interactions become significant when involving a fish approaching three feet or more in length.\u003c\/p\u003e\n\u003cp\u003eAlthough the species may occur in small schools in nature, keeping multiple adults requires public-aquarium-scale space and is not practical for typical private marine systems.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Whitemargin Unicorn Tang is considered \u003cstrong\u003ereef safe\u003c\/strong\u003e. Its natural feeding behavior is focused on algae when young and zooplankton as it matures rather than healthy coral tissue.\u003c\/p\u003e\n\u003cp\u003eIt does not normally prey on ornamental shrimp, crabs, snails, clams, or other common reef invertebrates. The primary reef consideration is physical rather than predatory: a very large adult can easily contact or dislodge poorly secured coral colonies while swimming.\u003c\/p\u003e\n\u003cp\u003eLarge reef structures should therefore be designed with generous clearance and secured firmly enough to accommodate the fish's eventual size and power.\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 are more important than repeatedly adjusting the aquarium to reach an exact value. Excellent oxygenation, stable salinity, strong filtration, and consistent water quality are particularly important for such a massive, active marine fish.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExceptional adult size:\u003c\/strong\u003e \u003cem\u003eNaso annulatus\u003c\/em\u003e can approach 39 inches, making it one of the largest surgeonfish commonly encountered in the aquarium trade.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDiet changes with maturity:\u003c\/strong\u003e Juveniles graze heavily on algae, while large adults become increasingly dependent on zooplankton and other drifting foods.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMajor long-term space requirement:\u003c\/strong\u003e This species requires an exceptionally large aquarium with approximately 10 feet of swimming length and is unsuitable for most home systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDeveloping forehead horn:\u003c\/strong\u003e The characteristic horn becomes increasingly prominent with maturity and is much less developed in juveniles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePowerful caudal blades:\u003c\/strong\u003e Mature specimens develop formidable cutting keels near the base of the tail and must be handled with extreme care during capture or transfer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"S","offer_id":52341668151594,"sku":"TANGxWhtUniS","price":80.99,"currency_code":"USD","in_stock":false},{"title":"SM","offer_id":52341668184362,"sku":"TANGxWhtUniSM","price":110.99,"currency_code":"USD","in_stock":false},{"title":"Medium (3.1-4\")","offer_id":52341668217130,"sku":"TANGxWhtUniM","price":143.99,"currency_code":"USD","in_stock":false},{"title":"ML (4.1-5\")","offer_id":52341668249898,"sku":"TANGxWhtUniML","price":194.99,"currency_code":"USD","in_stock":true},{"title":"Large (5.1-6\")","offer_id":52341668282666,"sku":"TANGxWhtUniL","price":251.99,"currency_code":"USD","in_stock":false},{"title":"XL (6.1-7\")","offer_id":52341668315434,"sku":"TANGxWhtUniX","price":368.99,"currency_code":"USD","in_stock":false},{"title":"XX (7.1-8\")","offer_id":52341668348202,"sku":"TANGxWhtUniXX","price":624.99,"currency_code":"USD","in_stock":false},{"title":"SHOW (8.1-10\")","offer_id":52341668380970,"sku":"TANGxWhtUniSH","price":809.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/WhiteMarginUnicorn_3786cc94-970a-4b25-86f7-bd07f46b2e14.png?v=1787766981","url":"https:\/\/topshelfaquatics.com\/products\/unicorn-whitemargin-tang","provider":"Top Shelf Aquatics ","version":"1.0","type":"link"}