I noticed today that the temp in my 28g nano was up to 82 or 83. I set the A/C to 82 during the day while I'm gone. Is that too warm for corals? I've got a hammer, yellow polyps and clove polyps. The hammer and yellows don't seem to be thriving. They took a hit about a month ago when I realized water had evaporated and my salinity was 1.027 so I added RODI water. They've never seemed to recover and was wondering if maybe the temp was part of the issue.