Have have all 3 of my tank heaters set to 78f. During July and August the tanks run a little hotter because of the hot weather. They run at a pretty consistent 80 degrees. What I'm wondering is, if the tank gets to say 81-82 on a hotter day what's the safest way to bring the tempature back down? Also, how fast it too fast? As long as it's not an immediate tempature change should I be ok?