Also known as the common lionfish, the turkey fish, the butterfly cod fish and the red fire fish. There are a few varieties of the Lionfish (antennata, fu manchu, radiata and russell's) with two primary types. The common (Pterois) and the dwarf (Dendrochirus). The common variety can grow to 12 inches (30 cm) or larger whereas the dwarf varieties usually only grow to half that size.
Take note that the spines on this fish are venomous and if you get pricked it may be fairly painful and you should probably seek medical attention. Be very careful when handling them (with a net) and while performing tank maintenance.

They are very efficient at polluting the water in your tank, so it is probably wise to give them no more than 1 small feeding per day. They require a good filtration system and highly oxygenated water. This means that you may need to have airstones in your tank in addition to the powerheads for water movement.

Dwarf Lionfish varieties could probably be kept in 30 gallon (114 liters) tanks or larger whereas the common lionfish should be kept in a 55 gallon (208 liters) or larger given their potential adult size.

Avoid putting them in a community tank with fish small enough to fit in their mouths. Otherwise, they will quickly rid your tank of the smaller fish. They will also go after some invertebrates so they are probably not a good choice for reef tanks.