moray not eating?
As some of the others have said, morays will often go on hunger strikes for weeks. The so-called "freshwater" morays often come into stores very malnourished and stressed out. They are also often injured or sick, so it's no surprise that they don't eat. Stop trying to feed your eel feeder fish (which have no nutritional value unless they are gut-loaded livebearers like mollies/platies). Keep live ghost shrimp in the eel's tank until it is eating regularly, then try frozen krill, silversides, etc. These can be offered from the end of a food stick.
Incidentally, it will benefit your eel greatly if you make its tank brackish or eventually marine (if you haven't already). This will help it avoid stress and sickness, especially fungus.
Good Luck,
Matt