Life of Sea | Jackknife Fish | The Jackknife fish from the Caribbean and is an interesting fish -shaped , with long dorsal and tail fins . The formation of these two fins resemble a Jackknife , hence its common name . These fish are silver in color with black forbidden patterns . Although they are not reef - safe , they are beautiful fish for saltwater fish only aquarium.
It requires a peaceful society in the 70 gallon or larger aquarium with a sandy bottom , and an abundant amount of live rock for a second hideout , and an additional food source . If you combine more than one into the aquarium , be sure to add it at the same time to reduce the likelihood of aggression . It tends to hide during the process of acclimatization to the new aquarium until it feels secure .
Regular meals consisting of a variety of items such as live black worms and brine shrimp and meaty items prepared should bring it out of hiding . Jackknife fish will be combing the sandy bottom looking for worms , crustaceans , and small fish if hungry . It may even eat fireworm occasionally