Jim,
tank temp is not a problem just kinda warm down there for me to be sitting due to the heat the 2 tanks put off, a 200 and a 72 totall around 1000 watts of pc bulbs alone, and then when we decide to turn on the 65" tv, with the home thearter then we got 2 300 watt amps that fire up ,
there is only 2 vents down there both stink due to location plus the 72 gal tank kinda blocks the return duct, so that doesn't help have 2 fans which help a bit but they also contribute to the heat as well, if some reason the 4 overhead lights are on then forget it , i am not really figuring i will need heat at all but to be honest i might need the a/c in the winter time not sure def need it now