Is 10% going to be enough to get it cleaned up though do you think? There was honestly drifts of uneaten food. She's 72, so I'm not blaming her. I blame my idiot cousin who was living with her. He's also the one that bought the pleco. Apparently there was two of them originally. I set the tank up for her originally but had moved away for a while. Things went downhill in the years I was away.