I've got a 12 gal. tank w 2 adult mollies, 1 "teenager", and several fry. I'm in an apt. bldg. and don't have total control over my heat. In this inbetween season when some days get hot, the apt. gets really hot. The tank is not in the sun and I havne't had any cooked fish yet, but I'm concerned.
Sometimes I open the "hatch" when I think it needs to cool off, but I really need a better solution bec I'm not always home.