have tank have fish can feed fish no idea how to feed eel

[Montwo]

hi I hve a 20 [acronym:f7d9251092="Gallon"]gal[/acronym:f7d9251092] tank in about four or five months I will gain 180 gallons on that but till then. I have a tiger oscar, a pleco of unknown kind (hope it gets big) and a tire track eel, I can feed the oscar and the pleco but the eel I would like to hand feed but what and how often, it will eat small feeder fish right now kinda funny thing though my oscar bites the heads off then kind moves them over to the eels area of the tank but is there also a kind of food that I can buy to feed my eel that isn't live or frozen that maybe sinks like the alge discs for my pleco