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I have a pleco to clean the algae in my tank and it's doing a great job, I can't spot any algae in my tank. However my tank is dirty. I know that to keep it clean I also have to clean it my self, but I'm looking for a fish that might help me keep it clean. It looks like it is mostly fish waste and plant matter making it look dirty. I have an under gravel filter and a filter that hangs on the back, so I know it isn't poor filtration. Should I feed my fish less? And will Cory catfish help, or will they just produce more waste? I'll try anything except snails!