Once it started eating and get comfortable in the tank and when that happens even with lights on it will eat. You can even train to eat by your hand. Once it gets use to you it will always beg for food.Thanks for the responses.....a little bit more insight into my tank....I've got 2 Uaru's plus 4 - 2" clown loaches in a 4ft 90G. Everyone eats great...feeding a variety of foods...NLS, bloodworms, dried krill, veggie flakes. King El...I will try your method...bloodworms..then shutting off the lights. Will the eel eventually get used to eating with the lights on?