interestingly, some blue ribbon eels do Okay. The key is a few things
1) small tanks, 25-40gal (live rock, lots of caves, and little foot traffic)
2)- keep the fish by themselfs (no competition)
3)-start them out feeding on live mollies, ghost shrimp, etc
4) get them when they are black (juveniles)
the key is to get them to feed
I'm not recommending these fish at all. However there has ben an increase in longer term survival of these eels. Most people plop these fish into an tank full of other fish, and expect them to live- They will not.
so if you've mistakenly bought one, try the techniques above, otherwise, leave him in the store
White ribbon eels are a totally different eel, not from the same family as blue ribbon eels, and actually do well in captivity, they feed well (they like ghost shrimp) and other small inverts