I gave mine treats of shrimp pellet, raw prawn, tons of fresh veggies, and floating cichild pellets. Mostly veg, but little treats of meatier foods can help draw them out for hand feeding. I've also noticed plecos in general really appreciate a shedule. Food on a certain cycle, at a certain time will have them on the glass waiting for it in short order. There's a great sticky on pleco diet up top, go check it out.