blood worms are not a meal for eels, eels eat large infrequent meals and store most of it as fat for times when they do not have food, and so can go for weeks without a feed So you can relax, if he hasn't eaten in a month it only means he is feeling a little peckish. For food though i recomend you try some shrimp meat something small on the end of a stick, i used a plastic coat hanger that was broken and jammed a bit of a toothpick in the hollow of it,
i think that using a white one is better because they can see it easier. wave the food in front of it, be patient they sometimes stare at it for a while wondering if its a trick, if in a good ten minutes they don't eat then leave it for later.