Just curious - why do your tanks get so hot? Do you guys not run a/c in the house so the room temp just goes up or what?
My house only has AC in the living room. It would too expensive to try to install it everywhere. Most of the houses where I live are about 30-50 years old so they don't have many upgrades. Only about 1 out of every 10 people I know have an AC.
And temperature increase can be caused by many things:
Faulty Heater
Intense Lighting
Hot Days
and a couple of other factors that I might be forgetting.