My parents are allowing me to convert my 40 gallon tank from freshwater to saltwater. I've already got a 187 gallon saltwater, so I do know how to take care of the water conditions. I am wondering if I can put a blue ribbon eel in the tank all by itself. If I bought one it would already be eating frozen. My LFS has a policy that all fish being sold are eating frozen food. What do you think? Is it worth a try? They've got one in right now that gobbles down frozen silversides.