No I did not dseed the substrate, my buddy is supposed to give me a pound from his tank. Flow wise I am running the SCWD with a Mag 12 rated at 1200 gph, two power heads of which I do not know the flow and the return line rated at 750 gph traveling 4 feet up. Can't afford to buy a canister filter got a new baby. but I would guess 2500 gph of flow including the powerheads.