I have a 120g tank and lose at least 2 gallons of water daily, maybe more. I have a canopy that is open in the back, and a 40g sump. I have two 175w MH lights which stay on about 8 hours a day, two 110w VHO actinics which stay on about 10 hours a day, a 75w light for the fuge that along with the lunar lights, is on when the actinics are off. Is there a way to decrease the amount of water lost to evaporation?