With daily auto-water changes, i've not 'manually' remove water from my system for a couple of years. Have some dead areas in the bottom of my sump that have collected crap, going to stick a powerhead in there to keep things in motion going forward but about to get in a vac it out. Any reason I shouldn't use a pump to suck up and drain straight back into the sump through a fine filter sock? Thinking there could be some nitrate release disturbing the detritus. Anyone do this? Bad idea? Any advice?