I have eco-complete for a substrate, unlike sand it just begs for the debris to settle into it so I have to suction the bottom like I would any gravel tank. I use a chopstick to loosen around the plants if I think that it is quite dirty there as well. Food never falls on to it without going right in so the little pygmy cory cats really can't do the job that they were made for. Pellets and algea wafers are also a bust as the matter just goes into the substrate.
ALASKA