What can I feed my pleco if he doesn't have algae?

I keep my 10 gallon fish tank very clean so my 2.5 inch pleco has no algae. He ignores the algae wafers i drop in the tank, so the tank gets foggy and my fish gets no food. A lot of people suggest banana but he ignores everything I drop in the tank. He's REALLY shy and hates people. Plz give me some advise on what I should give him!! :)