So my bf and myself have a saltwater aquarium set up.. I have a custom 72x20x18 long and he has a custom 42x16x24.. both are rimless.. anyway.. he had a stocked tank and I took all of his coral and traded in his fish because we both had the same tangs and clowns so I knew I couldn’t keep his fish.. now his is still running and ready to go but he wants the ugliest most predatory fish he can get that will fit his tank.. I mean the fish no one else wants.. like one of his favorites is the dragon eel.. and he thought the walking batfish was awesome but it is currently out of stock.. can you guys help me help him out? Thanks in advance