{"product_id":"humu-rectangle-triggerfish-rhinecanthus-rectangulus","title":"Rectangle Triggerfish","description":"\u003cp\u003eThe Rectangle Triggerfish is a striking, unmistakable saltwater fish known for its bold geometric markings and equally bold personality. Its pale body is contrasted by a large black wedge along the flanks, dark facial bands, yellow accents, and vivid blue lines around the face and fins. The result is a dramatic, highly recognizable marine aquarium fish that becomes an impressive centerpiece as it matures.\u003c\/p\u003e\n\u003cp\u003eNative to shallow reefs throughout the Indo-Pacific, \u003cem\u003eRhinecanthus rectangulus\u003c\/em\u003e is commonly associated with rocky reef zones, rubble, coral, and areas exposed to strong surge. In nature it actively searches the substrate and reef structure for crustaceans, mollusks, worms, echinoderms, algae, and other foods. This natural foraging behavior translates into an intelligent, active aquarium fish that frequently explores and rearranges its surroundings.\u003c\/p\u003e\n\u003cp\u003eIts territorial temperament and powerful jaws make it best suited to a spacious fish-only aquarium or FOWLR system with robust tankmates. Although highly desirable for its coloration, activity, and engaging behavior, it is not an appropriate choice for a conventional reef aquarium containing ornamental invertebrates.\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 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-Pacific, including the Red Sea and East Africa through Indonesia and northern Australia to Hawaii and the central Pacific\u003cbr\u003e\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eRhinecanthus rectangulus\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eTank Requirements\u003c\/h2\u003e\n\u003cp\u003eProvide a large aquarium with substantial open swimming space combined with sturdy rockwork, caves, and crevices. Rectangle Triggerfish are active and territorial, but they also appreciate secure retreats where they can wedge themselves into the rockwork when resting or feeling threatened.\u003c\/p\u003e\n\u003cp\u003eRock structures should be firmly secured. This species is a persistent explorer and may move loose rocks, rubble, shells, or other aquarium decorations while searching for food. A sand or coarse-sand substrate works well and encourages natural digging and foraging behavior.\u003c\/p\u003e\n\u003cp\u003eStrong filtration and efficient protein skimming are recommended because triggerfish are enthusiastic feeders and can place a substantial biological load on the aquarium. Moderate to strong water movement is appropriate, particularly when balanced with sheltered areas around caves. A secure aquarium cover is also recommended.\u003c\/p\u003e\n\u003cp\u003eLong-term housing should account for the fish's approximately 12-inch adult size, strong swimming behavior, and increasing territoriality as it matures.\u003c\/p\u003e\n\u003ch2\u003eDiet and Feeding\u003c\/h2\u003e\n\u003cp\u003eThe Rectangle Triggerfish has a broad natural diet that includes crustaceans, mollusks, worms, echinoderms, small fish, algae, and other reef-associated foods. In captivity, it should receive a varied diet with an emphasis on nutritious marine-based foods.\u003c\/p\u003e\n\u003cp\u003eOffer mysis shrimp, krill, chopped shrimp, squid, clam, mussel, scallop, and quality marine pellets or frozen carnivore blends. Occasional marine algae sheets or other vegetable-based marine foods can complement the diet.\u003c\/p\u003e\n\u003cp\u003eHard-shelled foods such as clam, mussel, and shell-on shrimp are particularly useful because they encourage natural feeding behavior and provide material for the fish's continuously growing teeth to work against.\u003c\/p\u003e\n\u003cp\u003eFeed one to two appropriately sized meals per day, adjusting portions according to the fish's size, condition, and overall aquarium nutrient load.\u003c\/p\u003e\n\u003ch2\u003eTemperament and Tankmates\u003c\/h2\u003e\n\u003cp\u003eRectangle Triggerfish are territorial and assertive, with aggression often becoming more pronounced as they mature. They are generally best maintained as a single specimen rather than with another Rectangle Triggerfish or closely related triggerfish.\u003c\/p\u003e\n\u003cp\u003eSuitable tankmates include appropriately sized, robust marine fish capable of competing for food and tolerating an assertive neighbor. Larger tangs, sturdy angelfish, substantial wrasses, and other similarly robust fish can be appropriate when aquarium space allows.\u003c\/p\u003e\n\u003cp\u003eAvoid very small fish, timid species, slow feeders, and fish with long or delicate fins. Caution is also necessary with other triggerfish and similarly territorial species, particularly in aquariums without enough room for separate territories.\u003c\/p\u003e\n\u003cp\u003eWhenever possible, establish more peaceful tankmates before introducing an aggressive triggerfish and provide multiple visual barriers and retreats throughout the aquascape.\u003c\/p\u003e\n\u003ch2\u003eReef Compatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eNot reef safe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Rectangle Triggerfish should not be considered suitable for a traditional reef aquarium. Its natural diet includes many of the animals commonly kept as ornamental reef inhabitants.\u003c\/p\u003e\n\u003cp\u003eShrimp, crabs, snails, clams, sea urchins, and other mobile invertebrates may be attacked or eaten. Corals and other sessile organisms can also be bitten, overturned, or damaged as the fish investigates and manipulates its environment.\u003c\/p\u003e\n\u003cp\u003eA fish-only or fish-only-with-live-rock aquarium is the preferred long-term 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\u003eStable water quality, strong oxygenation, and consistent maintenance are more important than attempting to maintain one exact value within these ranges.\u003c\/p\u003e\n\u003ch2\u003eCommon Considerations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eAdults can reach approximately 12 inches and require substantial swimming space and long-term housing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTerritorial behavior and aggression can increase significantly as the fish matures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSecure rockwork carefully because this species may move rubble, shells, and loose aquarium decorations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOrnamental shrimp, crabs, snails, clams, sea urchins, and other invertebrates are at significant risk of predation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProvide hard-shelled marine foods regularly to encourage natural feeding behavior and help wear the teeth.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TSA Fish","offers":[{"title":"T","offer_id":52422910738730,"sku":"TRIGGERxHumuT","price":25.99,"currency_code":"USD","in_stock":false},{"title":"S","offer_id":52422910771498,"sku":"TRIGGERxHumuS","price":53.99,"currency_code":"USD","in_stock":true},{"title":"SM","offer_id":52422910804266,"sku":"TRIGGERxHumuSM","price":59.99,"currency_code":"USD","in_stock":false},{"title":"M","offer_id":52422910837034,"sku":"TRIGGERxHumuM","price":80.99,"currency_code":"USD","in_stock":false},{"title":"ML","offer_id":52422910869802,"sku":"TRIGGERxHumuML","price":110.99,"currency_code":"USD","in_stock":true},{"title":"L","offer_id":52422910902570,"sku":"TRIGGERxHumuL","price":173.99,"currency_code":"USD","in_stock":false},{"title":"XL","offer_id":52422910935338,"sku":"TRIGGERxHumuX","price":221.99,"currency_code":"USD","in_stock":false},{"title":"XX","offer_id":52422910968106,"sku":"TRIGGERxHumuXX","price":299.99,"currency_code":"USD","in_stock":false},{"title":"SH","offer_id":52422911000874,"sku":"TRIGGERxHumuSH","price":569.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/RectangleTrigger_25a75aff-6a7e-4173-834e-78a100a023d6.png?v=1788191722","url":"https:\/\/topshelfaquatics.com\/products\/humu-rectangle-triggerfish-rhinecanthus-rectangulus","provider":"Top Shelf Aquatics ","version":"1.0","type":"link"}