Tank at 30 degrees

[tlo]

my tank overheated a few weeks ago to 30. It was a pump problem, so it never got a chance to cool down during the night. It was like like that for probably 24 -36 hours b/f I realized what was causing it. I lost a chalice, and an sps frag and some of the other corals bleached. So, from my experience, I would start to be a little concerned about that.