Dirty jobs just had an episode at a striped bass fishery and they used carp and tilapia to break down the poo. Of course they further processed it after that through filters, condos, and their own estuary, but yes they were poo eating fish.
:rofl: People will whip you for "overstocking" your tank.So if that common pleco isn't keeping your 10g clean, just add a tilapia!!