rio pumps/sumps

[Tarolisol]

Im not expert but with a refuge most people put different sorts of algea in it like calerpa. It helps in filteration in a big way. Also it can be a safe place for pods and other organisms to grow to feed your fish. Dont know much about the pumps but I have to mags and 7 and 18 that work well. Havent heard to many good things about rios.