They're super easy to feed, they'll eat anything!
Do you have enough hiding places for them? They like lots of driftwood and rocks. Just drop in a wafer (or anything) after the lights are out and they'll come out to get it. Mine eat flakes, shrimp pellets, algae wafers, frozen food, vegetables, freeze dried food, anything I put in there really. Even when I feed during the day, as soon as they smell it they'll frantically come put of their holes sniffing around for any bits or pieces left over.
Sent from my iPhone using Aquarium Advice