I had 2 coral colonies (garf bonsai, pink birdsnest) that I thought I had killed (bleached) a year ago because of a phosphate/nitrate/alkalinity issue. Low and behold, I cut away the skeletons and there was nothing left or at least I thought. About 8 months later the bonsai started growing back (2" long now multiple stems) and I noticed the birdsnest growing back about a month ago. It is a little over an inch long now multiple stems.
You just never know.
I have about another half dozen or so I killed in that same episode that I am still holding my breath for.
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