Mine went down to 70 degrees on Tuesday - I did a water change, turned off the pump to my fuge where the heater is, and forgot to turn it back on! What a maroon! Anyway, we noticed it after about 24 hours. Fired up the pump, and all seems to be well. Back to 80 in about 12 hours. Thought maybe the bubble coral might be wounded, but he's fine. My torch didn't like, but recovered fine. The hammer actually seemed to LIKE IT. I can tell you that on real reefs, unlike what you read, HUGE temperature changes are often found. We were in Belize sailing last summer, and the water on the reef in spots was near 100. Seriously, it was like a hot tub. When there's no wind, no waves and 95 degrees... Everything seemed stressed though...
Bill
215g FOWLR... and anemones, GSP, gorgonians... carp, that isn't FO!
"I killed my first SW Fish in 1971..."