I have a snoflake eel and he gets along with an aggressive lion fish and a parrot wrasse. The wrasse and the eel even share a shell!
The only problem is that they can grow quite large.... and make sure you have a closed tank since they like to escape through the top!
80gal tank, 150lbs lr
, 2x250w 14k mh
Fish: Emperor angel, 2 maroon clowns, blue tang, 6 line wrasse