Actually, I've had the tips of some birdsnest frags die on me when they were out of the water too long. This happened when I removed my frag rack for some cleaning in my DT, and it was out of the water a little longer than I had planned. All my other SPS frags were OK, but several of the birdsnest tips were damaged. I guess they are so thin, and just don't hold the water as much as the others.
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