How to Care for Lionfish 
Despite their differences in size, the true lionfish and the dwarf lionfish have similar captive habitat requirements (except, of course, for minimum tank size). Lionfish have a reputation as being remarkably hearty fish (second only to damsels some say), and while this is true, some care should be taken to provide lionfish with an environment that meets their species-specific needs.
Lionfish are not known to be particularly territorial and will share their cave or other place of refuge with members of their own species or other lionfish species. Having said this, keep in mind that recommended stocking densities for true lionfish are about 40 gallons per lionfish (and about half that for the dwarfs). They prefer coral reefs and rocky outcrops, although they have occasionally also been found in mangroves, seagrasses, lagoons, and harbors. The maximum size seems to be about 15 inches.
Lionfish are voracious predators. When hunting, they corner prey using their large fins and then use their quick reflexes to swallow the prey whole. They hunt primarily from late afternoon to dawn. In captivity, lionfish can be trained to eat frozen krill and mysis.
