Should You Cover Your Sump


My sump came with a glass cover. The instructions say to cover the sump, but after I put the protein skimmer in, the cover will not work. I don't remember seeing any sumps covered in pictures. I know it will help cut down on evaporation.
I could get glass cut to fit around the skimmer. Any thoughts?


Active Member
i would leave the cover off. gas exchange and heat transfer are more important to me than evap.
keep the top off and the fan is a good idea, i did that on my old sump, but now i have four tanks in line and don't need the evap.