This thread is from last year guys, thx though, hehe. I don't worry about heat in the BC anymore, nothing in there really. We have AC in the bedroom, so if it is warm I just open the lid a bit. I did look into the nanotuners last yr but with all the expense of the nifty things they have there I was better off just going with a bigger tank, so I did.
I did the same thing with a fan as spanky there and have a fan on my 48g rigged to turn on when the 10k's go on-- works nicely. I saw some nice little tiny metal fans at wal-mart a bit ago. Think I might pick one up to run over the sump--when I get a sump.