They will eat anything they can get their mouths on,
Yeppers, and those fish that were listed were all small enough to be lunch - especially if the eel is of a decent size. I'd stick with fish for that tank. Were there any other fish you were considering besides a Yellow Tang? If you wanted a "snakey" looking fish, you could always go with an engineer goby...or something else? Do you have a sand bed, or is your tank BB?

W.