Have you researched articles? I'll save you the trouble. here is something from Bob Fenner...
Species to Generally Avoid:
I know I'm going to get heat for this section as usual. There are folks who have had Moorish idols that thrived on banana chips; still others carrying on clairvoyant relationships with their Ornatissimus butterflies. I've seen this, have mercy! But for most of us mere mortals the following does hold true.
Rhinomuraena species, the Ribbon Moray Eels. Ninety nine percent plus do not live a month in captivity. Most starve, refusing all food. Next most common category of loss is escape through the smallest of top openings, or plumbing. Last is "simple stress".
The written record shows some people's success with netting food and eel together and shaking, training on select live skewered items; but most black to blue to all yellow female ribbon morays perish within a short while. You've been cautioned.