{"product_id":"engineer-goby-pholidichthys-leucotaenia","title":"Engineer Goby – Pholidichthys leucotaenia","description":"\u003cp\u003eThe \u003cstrong\u003eEngineer Goby\u003c\/strong\u003e (\u003cem\u003ePholidichthys leucotaenia\u003c\/em\u003e), also known as the Convict Goby or Convict Blenny, is a unique saltwater fish known for its dramatic black-and-white coloration and constant burrowing behavior.\u003c\/p\u003e\n\u003cp\u003eDespite its common name, the Engineer Goby is not a true goby or blenny. It belongs to the family \u003cstrong\u003ePholidichthyidae\u003c\/strong\u003e. Juveniles display bold horizontal black-and-white stripes, while adults gradually develop darker vertical bars and a more elongated, eel-like appearance.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDistinctive black-and-white striped juvenile coloration\u003c\/li\u003e\n\u003cli\u003eColor pattern changes significantly with age\u003c\/li\u003e\n\u003cli\u003ePeaceful marine fish\u003c\/li\u003e\n\u003cli\u003eStrong burrowing behavior\u003c\/li\u003e\n\u003cli\u003eBest suited to aquariums with deep sand beds\u003c\/li\u003e\n\u003cli\u003eReef compatible with caution\u003c\/li\u003e\n\u003cli\u003eCan reach approximately 10–12 inches or more\u003c\/li\u003e\n\u003cli\u003eNeeds securely positioned rockwork\u003c\/li\u003e\n\u003cli\u003eConsumes meaty marine foods\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFish Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommon Name:\u003c\/strong\u003e Engineer Goby\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso Known As:\u003c\/strong\u003e Convict Goby, Convict Blenny\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003ePholidichthys leucotaenia\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Pholidichthyidae\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Type:\u003c\/strong\u003e Saltwater \/ Marine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperament:\u003c\/strong\u003e Peaceful\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdult Size:\u003c\/strong\u003e Approximately 10–12 inches, with larger specimens possible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiet:\u003c\/strong\u003e Carnivore\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCare Level:\u003c\/strong\u003e Moderate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef Compatibility:\u003c\/strong\u003e Generally reef compatible with caution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eColor and Appearance\u003c\/h3\u003e\n\u003cp\u003eJuvenile Engineer Gobies have a striking black-and-white horizontal striped pattern that can resemble a coral catfish.\u003c\/p\u003e\n\u003cp\u003eAs they mature, their markings change dramatically. Adults develop darker vertical bars and irregular markings over an elongated body.\u003c\/p\u003e\n\u003cp\u003eTheir eel-like swimming motion and unusual adult appearance make them one of the more distinctive marine aquarium fish.\u003c\/p\u003e\n\u003ch3\u003eAdult Size\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies commonly reach approximately \u003cstrong\u003e10–12 inches\u003c\/strong\u003e as adults, and some individuals may grow larger.\u003c\/p\u003e\n\u003cp\u003eBecause they are frequently sold as small juveniles, customers should be aware that this species becomes much larger than it initially appears.\u003c\/p\u003e\n\u003ch3\u003eRecommended Aquarium Size\u003c\/h3\u003e\n\u003cp\u003eA \u003cstrong\u003e55–60 gallon aquarium or larger\u003c\/strong\u003e is recommended for an adult Engineer Goby.\u003c\/p\u003e\n\u003cp\u003eLarger aquariums are preferred when keeping multiple Engineer Gobies or when housing them with additional marine fish.\u003c\/p\u003e\n\u003ch3\u003eRecommended Water Parameters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e Approximately 72–78°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e Approximately 8.1–8.4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecific Gravity:\u003c\/strong\u003e Approximately 1.020–1.025\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlkalinity:\u003c\/strong\u003e Approximately 8–12 dKH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmmonia:\u003c\/strong\u003e 0 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrite:\u003c\/strong\u003e 0 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrate:\u003c\/strong\u003e Maintained at appropriate marine aquarium levels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSand Bed Requirements\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies are powerful burrowers and should be provided with a substantial sand bed.\u003c\/p\u003e\n\u003cp\u003eA few inches of sand allows the fish to construct the tunnels and burrows that give the species its common name.\u003c\/p\u003e\n\u003ch3\u003eImportant Rockwork Warning\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eRockwork should be securely positioned before adding the sand substrate whenever possible.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEngineer Gobies may excavate underneath rocks while building tunnels. Rock structures resting only on loose sand can shift or collapse as the fish digs beneath them.\u003c\/p\u003e\n\u003cp\u003eStable rockwork placed directly on the aquarium bottom or otherwise securely supported greatly reduces this risk.\u003c\/p\u003e\n\u003ch3\u003eBurrowing Behavior\u003c\/h3\u003e\n\u003cp\u003eThe Engineer Goby spends much of its time building and maintaining tunnels beneath rocks and throughout the sand bed.\u003c\/p\u003e\n\u003cp\u003eThis natural digging behavior can move considerable amounts of substrate. Sand may occasionally be piled around rockwork, corals, or other aquarium structures.\u003c\/p\u003e\n\u003ch3\u003eFeeding\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies are carnivorous and should receive a varied diet of appropriately sized marine foods.\u003c\/p\u003e\n\u003cp\u003eSuitable foods include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFrozen mysis shrimp\u003c\/li\u003e\n\u003cli\u003eBrine shrimp\u003c\/li\u003e\n\u003cli\u003eChopped shrimp\u003c\/li\u003e\n\u003cli\u003eKrill\u003c\/li\u003e\n\u003cli\u003eChopped squid\u003c\/li\u003e\n\u003cli\u003eQuality carnivore pellets\u003c\/li\u003e\n\u003cli\u003eOther appropriately sized marine meaty foods\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFeeding once or twice daily is generally appropriate. Shy adults may benefit from food being delivered near the entrance to their burrow.\u003c\/p\u003e\n\u003ch3\u003eTemperament\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies are generally peaceful toward other appropriately sized marine fish.\u003c\/p\u003e\n\u003cp\u003eHowever, very small fish or ornamental crustaceans may be at risk, particularly as the Engineer Goby grows larger.\u003c\/p\u003e\n\u003ch3\u003eCompatible Tankmates\u003c\/h3\u003e\n\u003cp\u003ePotential tankmates may include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClownfish\u003c\/li\u003e\n\u003cli\u003eTangs\u003c\/li\u003e\n\u003cli\u003ePeaceful wrasses\u003c\/li\u003e\n\u003cli\u003eCardinalfish\u003c\/li\u003e\n\u003cli\u003eMarine angelfish where aquarium size allows\u003c\/li\u003e\n\u003cli\u003eOther peaceful to moderately assertive marine fish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAvoid very small fish that could eventually be swallowed and highly aggressive species that may harass the Engineer Goby.\u003c\/p\u003e\n\u003ch3\u003eReef Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Engineer Goby is generally considered reef compatible because it does not typically consume corals.\u003c\/p\u003e\n\u003cp\u003eHowever, its digging can undermine rock structures or bury corals placed near the substrate.\u003c\/p\u003e\n\u003cp\u003eFor this reason, it is best described as \u003cstrong\u003ereef compatible with caution\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eKeeping More Than One\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies may be kept in pairs or small groups when sufficient aquarium space is available.\u003c\/p\u003e\n\u003cp\u003eWhen adding multiple individuals, introducing them at the same time may improve compatibility.\u003c\/p\u003e\n\u003ch3\u003eSecure Aquarium Lid\u003c\/h3\u003e\n\u003cp\u003eA securely fitted aquarium lid is recommended.\u003c\/p\u003e\n\u003cp\u003eEngineer Gobies may jump or find openings around plumbing, filtration equipment, or aquarium covers.\u003c\/p\u003e\n\u003ch3\u003eBreeding\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies have been successfully bred in captivity.\u003c\/p\u003e\n\u003cp\u003ePairs may reproduce within their burrow system, although breeding behavior can be difficult to observe because much of their activity occurs beneath the substrate and rockwork.\u003c\/p\u003e\n\u003ch3\u003eImportant Care Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis is a saltwater fish, not a freshwater goby.\u003c\/li\u003e\n\u003cli\u003eProvide at least a 55–60 gallon aquarium for an adult.\u003c\/li\u003e\n\u003cli\u003eExpect an adult size of approximately 10–12 inches or more.\u003c\/li\u003e\n\u003cli\u003eProvide a deep sand bed for burrowing.\u003c\/li\u003e\n\u003cli\u003eSecure all rockwork before adding the fish.\u003c\/li\u003e\n\u003cli\u003eProvide a varied carnivorous marine diet.\u003c\/li\u003e\n\u003cli\u003eUse caution with very small fish and ornamental shrimp.\u003c\/li\u003e\n\u003cli\u003eUse a tight-fitting aquarium lid.\u003c\/li\u003e\n\u003cli\u003eMaintain stable marine water parameters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Engineer Goby really a goby?\u003c\/strong\u003e\u003cbr\u003eNo. Despite the common name, it belongs to the family Pholidichthyidae rather than the true goby family.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Engineer Goby freshwater or saltwater?\u003c\/strong\u003e\u003cbr\u003eIt is strictly a saltwater marine fish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow large does an Engineer Goby get?\u003c\/strong\u003e\u003cbr\u003eAdults commonly reach approximately 10–12 inches, and larger individuals are possible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size tank does an Engineer Goby need?\u003c\/strong\u003e\u003cbr\u003eA 55–60 gallon aquarium or larger is recommended for an adult.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is it called an Engineer Goby?\u003c\/strong\u003e\u003cbr\u003eThe name comes from its habit of constantly excavating sand and constructing tunnels underneath aquarium rockwork.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs an Engineer Goby reef safe?\u003c\/strong\u003e\u003cbr\u003eIt generally does not eat corals, but its extensive digging can shift rockwork or bury corals near the substrate, so reef compatibility should be considered with caution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need sand?\u003c\/strong\u003e\u003cbr\u003eYes. A deep sand bed is strongly recommended because burrowing is an important natural behavior for this species.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan Engineer Gobies be kept together?\u003c\/strong\u003e\u003cbr\u003eYes. Pairs or small groups may be kept in appropriately sized aquariums, particularly when introduced together.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eEngineer Gobies are available at \u003cstrong\u003eTropical Treasures Wyo\u003c\/strong\u003e in Cheyenne, Wyoming, when in stock.\u003c\/p\u003e\n\u003cp\u003eLive fish are available for \u003cstrong\u003ein-store purchase or local pickup only\u003c\/strong\u003e and are not available for shipping.\u003c\/p\u003e","brand":"Tropical Treasures Wyo LLC","offers":[{"title":"Default Title","offer_id":54893384564949,"sku":null,"price":15.99,"currency_code":"USD","in_stock":false}],"url":"https:\/\/tropicaltreasureswyo.com\/products\/engineer-goby-pholidichthys-leucotaenia","provider":"Tropical Treasures Wyo LLC","version":"1.0","type":"link"}