I finally upgraded from a 55 gallon to a 75. I find it hard to believe that the sump evaporates almost a gallon of water a day. Is that correct? I'm new to a sump, so am I doing something wrong?
Do you use an auto top off? If not I highly recommend investing in one. There are many kinds and range in price. Personally I use a dual float system from autotopoff.com, not the prettiest and most high tech but it's on my sump so appearance isn't an issue and it works which is the main thing. If you do run an ATO then disregard.