I'm just going to say right off the bat that I want a bottom feefer primarilly that can carry more than its own weight, meaning a bottom feeder that doesn't have a huge bioload but almost exclusively feeds off fish waste. I already have a 12" pleco that does a AMAZING job at keeping the tank spotless of algae (haven't scrubbed algae in MONTHS) I also have a 6" striped raphael catfish, 8" kelberi Pbass, 13" oscar (I want to get rid of), and two 7" goldfish that go in a fountain for half the year. The tank is 120 gallons. Also the fish can't be smaller than 6" or larger than 10". Thank you please answer quick if you can!!!!