About 2 weeks ago the fiancee forgot to leave the air conditioner on and I came home to find my tank was 94 degrees. By the next day the temp had come down. I left all tank lights off for 2 days. then at 4 hour intervals i phased back in teh actinics then the metal halides. I lost a few pieces immediately. slowly over the last 2 weeks i've been seeing other pieces suffer and die from tissue necrosis. i can see my acros go from healthy one day to RTN the next then dead 2 days later. when i realized what was going on, i did a 20% water change and changed the carbon. Initially i was using brightwell restore on the tank. i also dose elos amino's and just a week ago started dosing zeovit coral vitalizer (i figured the timing would actually help bring the tank some health). after the spike i introduced 2 new acros to the tank. they looked great for a week and today i notice the tips of one starting to RTN, although it looks healthy otherwise. To top it off a few other pieces are growing nicely and are continually coloring up, maybe there's hope yet????? all tank parameters are good, although my nitrates are a little high, but i figured that was from the tissue die off, maybe 10 -15ppm.