The Dawrf Lionfish is an aggressive fish. They can grow up to 7 inches and will need an aquarium of at least 50 gallons with plenty of rock to hide. They usally like to be alone but can be placed with other aggressive fish. Smaller fish if it can fit in its mouth it can eat it. Thier spines are venemous and should be very careful when handling them. We suggest not with your bare hands. The Lionfish&39,s diet consists of live and frozen meaty foods.