I have a common pleco that has kept my tank clean. He's about 7 inches now. He was 4 inches when I got him.
There is not much algae for him to eat anymore, so he eats shrimp pellets.
We drop some in, let him eat, and then we drop more in and he then lets the loaches eat.
I am looking to get rid of him, as he's getting a little large for my 75 gallon, and I would like to get some smaller plecos like the royal pleco etc.