fastrd400
It wasn't me!
May be a bad thermometer. I am always afraid mine will fail, so I got in the habit of running 2 in my tank.
I think the fan idea will be better than the ice cubes...a few cubes won't even lower the temp, you'll need a whole lot of cubes...I hope your corals recover. That's another drawback of having a smaller tank I guess, the temp raises and falls quickly according to the room temp.
Dave you might consider a small chiller in your case.