Just upgraded to 92 gal from 30 gal this past weekend. Evaporation has gone through the roof! On the order of 2-3 gal/day! I know it's not leaking because salinity goes up as water decreases.....Lighting is 2 250 watt HQI MH w/ 10,000K dbl end bulbs (1 Aqualine Buschke, the other Ushio)