I had a clown pleco, peckolita vittata, in my lower light 25g tank, and I nver saw him do anything about algae, but after moving him to my high light and heavy planted 66g, he's a regular vacuum cleaner. I was bugged by some beard algae on my pygmy chain sword, as of late I've been watching this pleco go mad over brown algae. Today I noticed all the chain words are clean, except for lil telltale scratches on the leaves where his teeth left marks. But that I can live with.