In my 10g the corys are doing a good job eating uneaten food but now brown algae is showing up on the gravel and not even a single ray of light touchs the tank but the algae is there. So I need a algae eater to eat this algae. I know my common pleco eats it because when he was in the tank he ate all the brown algae that was in there. So is there any other fish that will eat it?