I am having some real issues with the temp of my tank. During the I like to keep my tank at about 80 and at night about 80 to79. Well here is my problem during the day I leave my fans on to keep my lights cool and that drops my temp down to about 75. At night if I shut my fans off then the halide I have on my sump heats the tank up to about 83. I can't seem to figuer out how to keep my at the right temp. Any help would be great. Thanks.