I think my pl*co is on strike. He just sits around the tank mostly. It appears the only real things that he cleans are my plants and some of my rocks. He rarely goes to the top most rock out in the open at the top of the tank and he never cleans the front of the tank (glass) and I get a break out of brown algae on the glass and he apparently doesn't want to clean it. I know they don't like green algae but he should be going after the brown algae. He's a single pl*co in a 40 gallon tank (he's about 2 1/2 inche's long) Should I pick up another?