Well I do have my returns split into two(I'm using 3/4" loc-line and they are aimed at the surface, and I have moved my center Koralia upward a bit more so there is definately good surface agitation and with the other two Koralias pointed downward a little and toward the center of the tank, there should be some pretty good flow through out the tank. As far as heat in the tank, and other issues related to the glass tops, I'm not really sure if it will be a problem. I have always had a cover on my 20 Gal and the temp has always remained pretty constant at 78 - 80 and that is a much smaller volume of water so one would think a bigger tank would be more stable. But if I start seing flucuations, I will definately take the tops off and see if it helps. BTW, I still owe you guys/gals a pic with the new LR in the tank so I will get one up this afternoon.
I got some stuff at the hardware store last night to organize the inside of my stand so I'm gonna work on that too, but first I need to change some water because my nitrites and nitrates starting to spike.