Olly, how is that going to work? Is the whole tank on a lean? If so, how do it stop it from flowing over the sides?
The only way to stir up things on the bottom is to either have your overflow intake closer to the bottom (not really an option if you have an overflow sump), to have a powerhead at the bottom stiring it up/more water/air movement close to the bottom, or having some bottom dwellers who stir up the poop.
However, if you have an ammonia problem, you'll still have an ammonia problem if you don't remove the poop. You need more biological media, or more flow to your sump.
How's your sump set up now?