I have oto's and red cherry shrimp in my 50gal along with plecos and cories and they all get along well... infact I have to take shrimp out of the tank every so often to keep the popuplation under control. As for feeding all bottom feedeers compete for the same food, the excess that falls when you are feeding your fish. I suplement my feeding regime with carnivore pellets, algae pellets and vegetables all of which are consumed by the above.