anything that you would feed fish, esp. catfish. flake food, algea wafers, spironella (sp. ?), bloodworms, fruit flies, dead plants, algae, dead bugs (crix work good if you mush them up a little), and i wouldn't feed spinish because spinish makes it harder for them to digest calcium which can result in bone deformities, but little chopped up pieces of romaine or greens would work i guess. i think they would like the other stuff better though, good luck!