I have a pretty nice sized eel in my tank, and like Hara said, "The good points, which to me outweigh the bad....they are just darn cool. " He likes to rearange my tank daily. I cant put anything where i want it, guess he is into Fung Shui. As a rule of thumb, if the eel can get a fish into his mouth, he WILL eat it. They are just like snakes, they can open their mouths to twice the size of their bodies. I made the mistake of bringing home 2 Coral Beauties, about 3" in size. I brought 1 of them back to the fish store, my eel had an expensive meal that day. Other than that, i feed him fresh shrimp, scalops, squid, smelt, and clams.