Hi All Not sure if I should be concerned or if other reefers have the results. I seem to be losing between 40 and 50l of water a week. That’s about 6% To 8% of my total volume. I don’t have a cover over my tank and my sump is also open and lives in the garage. I have checked for leaks but cant find any. My water temp is at 26 so in my I shouldn’t be losing that amount of water. I don’t have any Fans and there is no draft near my tank. My Biggest issue is not the fact that I am losing the water it is that I am still using tap water until I can get my RO Unit most likely next month and am worried about the amount of K*** I am adding to my tank. Who else has this type of evaporation or should I keep looking for a leak?