Unless they're a variety that requires sand(Garden Eel) then they should be fine. I wouldn't bother with BB on a fish only tank since their requirements aren't as stringent.
to be honest with you i got a snowflake eel just playing aroudn with the eel idea and i love it, the most active thing ever, i even added a barred moray eel and they get along great with my yellow tang.
snowflakes are typical but they can be pretty fun and entertaining