What do you feed a pleco when it gets bigger?

Not only will he look after any algae in the tank, he will also scavange for leftover fish food on the bottom. Another great food for them is to boil slices of cucumber or zucchini for a few mins, (boiling them makes them sink) and dropping a couple in every night. They LOVE that...or you can also buy algae tablets to feed them with. Hope this helps.