Since it would be the only pred you are feeding live, I'd probably just get a couple/few now and then and just drop them in. Most lfs feed their mollies decently. Since it is a reef I would assume you are keeping reef level ca and mg. These are important elements and eels that are not getting bones and shells could be lacking. Mg is also beneficial in digestion. Over feeding usually in the form of feeding to frequently is also a cause of early demise. Guys I know keeping eels for over a decade also seem to feed less often, like once a week, some even less often.
