if i have a siphon over flow box going to a..., lets say 40 gallon sump/wet/dry filter. how do i get perfect balance of water in it. so if the water is flowing in a little big faster than the pump is pumping out it going to overflow every where eventually, right? Or if the pump is pulling out faster than you pumping in its going to get to low. so whats the secret. Im new to this so take it easy.