if you get to feed it, it'll be a big accomplishment! ribbon eels in general don't adapt well to aquariums because they reject food. I bet it's beautiful thought, I wish i had one! I just read more cons than pros with this beauty... sorry
Anyways, a lot of people try it all, from frozen to live food, pellets, etc. Start with whatever you can get it to eat try it all, i've heard someone got it to eat all their hermit crabs by accident, but pray from there that you can feed it more and more, good luck!