if he has the tank size I'd say a with a bicher, rope fish, and fire eel you'd need a 125+Get a fire eel!
Yea I'd say your pretty stocked might be able to fit a spiny eel in there.A fire eel would be awesome! But I'm afraid that I am pretty limited. My tanks 4ft. 125cm by 55cm by 55cm. With a 2 baby senegal bichirs, 2 ropefish and an african knife. Planning on getting a couple congo tetras and a bushfish. So I guess maybe no eels