Wishbone, I put an idea on you post in the general discussion area, ref water cooling.
As for the egg crate, I did not get to it yet. Maybe tomorrow. But for my tank, I will leave half the glass top on, under the light, then convert the other half to open top with the egg crate. Don't know if this is an option for you...
I'd have more tanks if there was more room. If I could get my kids to share a room, and.....