82 is not bad. I actually like mine at 80-82. A big swing would not be good though. Just try to bring it down slow. My tank is 81.2 right now
*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,