I normally run a fan on the sump to help with temps. I am acclimating my livestock to new MH
bulbs so temps are not too bad since the MH
's are on for a shorter time.
I used to have 1 heater but switched to 2 to help with swings. I would love to keep my tank at 82!
Once I move the sump, I hope to not need all the fans I have in my canopy either.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,