I have a 92gl Corner Tank, a 65gl refugium, and a 29 gl tall sump tank split into 2 sections. The first section is where the return is along with the protein skimmer. The other side is the return. The sump is devided by a simple over and under design with a black sponge filter between the tow sides.\n \nWe are currently loosing way to much water from the return side. About a 1 to 2 gal every day. I have tried to regulate the return water with the valves that are piped in but this didn't work either.\n \nHow do I control this excessive water loss?