Quote:
Originally Posted by DetectiveTofu
Corals deal with this during low tide all the time. Hell, I ship corals dry.
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They don't deal with it all the time. Those photos are from extreme low tides that only happen a few times a year, and they don't always happen during the day. While its not a problem to expose them for a little while, dropping hte water in your tank for a couple of hours is, in my opinion, asking for losses at one point or another. You can easily shave 1 1/2 hours off of that cleaning time and still get everything done that you need to. Or, maybe set up a shop light over the tank so you still have light but aren't baking the corals under your lights.
I always expose my corals to air when transfering them to my tank, and during large changes they are exposed, but I try and minimize it if and when I can.