Would it be better to keep less or more water in a sump or is there no effect in regards to evaporation? Would like to figure out a way to limit the rate of evaporation. I usually have to top off 1g of distilled water in my 75g with every 3-4 days. Would like to do less of those. And of course I have a Chiller and keep my temp set at 78 degrees. Here is my current water level. I leave about 5 inches now when before it would be around 4. Height of sump is 16 inches.