Ok. I haven't been able to find any reading on this other then people stating that they've got Sand and live rock in their sumps for fitration. I don't have any sand in my sump. It's just barebottom and makeshift. My problem is that i've developed quite a bit of debri on the bottom on the sump and I'm wonder what to do to eliminate this problem, other then syphoning(sp?) it out. I don't want to use a filter sock because i have a refugium and want it to be fed by the excess. Any ideas? Thanks -frank.