my buddy who runs both a fug and a sump for his bb tank, just made sure to put one of his return lines, he has two, very near the bottom of the tank, that way all the crud instead of settling on the bottom, stays in the water coloum and actually gets picked up by the mechanical filtration, which seems to me one of the best ideas for bb tanks. After about 6 months pretty much the whole bottom of the tank is covered in corraline algae that u actually get to c the pretty purple coralline b/c all the crud is not sitting on top of it.
Adie
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