I have Roseline Sharks, they have learned to hover just behind my Oscar and eat up all the mess she makes, also I have 2 Spotted Raphael cats and a Blue Phantom pleco so by time waterchange/ tank cleaning comes around there is not much to clean up.
For cleaning up their excess food, I have a convict pair. They are tough enough to not tolerate being bullied without fighting back. I also have an African Squeaker Catfish that is living the good life off of their leftover food. When the Oscars get insects, everybody gets pieces of insects!jhook what kind of fish are you using to clean up the Oscars mess?