Disaster!

[Stones]

Originally Posted by Aquattro

I bought a large stag acro and it was too large to pack. I moved it to my house dry in a rubbermaid tub. I was probably out of water 70 or 80 minutes. No issues. I once burned the tips of a coral under a 400w bulb by leaving the water low for 30 minutes, but that's an extreme. Your lighting shouldn't cause any issues like you describe. Worst case, you could get a lot of slime, but no losses.

+1

Probably 1/3 of my acropora are fully exposed when I do water changes on my tank and they are sitting only 10" under 12 x 80 watt T5 tubes that I leave on so I can see what I'm doing. Most of the time they are out of the water for 30 mintues by the time I fininsh refilling the tank and sump and I've never experienced any losses from this.

I'd have to agree that likely one of the parameters in you new water was off and alkalinity is commonly the cuprit. Too high mag levels can also cause problems but you usually don't see high magnesium in any of the comercially available salts.