well, the return pump that i had was rated for 900 gallons an hour. i figuered that it was a little to much for the overflow to function silently. so i put a sponge in front of the pump intake. with the sponge over the pump intake, i think about 200 g an hour is going through the overflow. it works completely silent now, and i would say that it is the perfect ammount of flow through the fuge/sump.
will this damage the pump?
thanks