Really easy/basic question (embarassing actually)

Now that I have a tank with a sump, it's okay to cover the main tank almost completely, right? As long as the sump gets plenty of air and I have a skimmer that adds oxygen too.
 
With LEDs the heat isn't as much of an issue. But I have noticed on some warm days recently that it went 2 degrees above what I have it set for. I guess on those days I can remove the covers. The tank is acrylic and just has three cutouts on top that I can remove (about 5"x12" each), and the rest is totally enclosed. I don't see that much salt buildup. I may want to get a wrasse, and also I have enough evap from the sump that I don't need to make any more RODI than I already do.
 
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