Opinions wanted.

[Myka]

Originally Posted by reefwithareefer

In the cooler months I can maintain within a degree, but this type of weather causes it to fluctuate 2 or 3 degrees. It is 80.2 now and by morning it will be 77ish.
Halides give off alot of heat, then add in 320 watts of T5s inside a canopy and it keeps the chiller running...

If that's the case, then bump up the night temp to 79 so that you have a smaller swing. IME, it's the swing that bothers them more than the actual number. My SPS tank ran at 84F with halides and T5s and it did pretty good. Our house temperature doesn't change much from summer to winter, so that temperature was maintained all year. I had fans to keep it that "cool".