Had a few do this. Plate coral one time. Algae frags stored in bucket I forgot about with 1.05+ salinity come back. (was in bucket for over a year without top) Basically at the point where there was salt slush in it.
Once German blue monti was just not doing good for some reason. Similar once with a setosa. Withered to maybe a few polyps left on each branch. Broke all to tiny pieces glued together and came back to colony over time. Some cyphastrea, baby elegance pop up, and lots of things actually.
Now that is pretty impressive.dried out in a bucket for 5+ years
Once German blue monti was just not doing good for some reason. Similar once with a setosa. Withered to maybe a few polyps left on each branch. Broke all to tiny pieces glued together and came back to colony over time. Some cyphastrea, baby elegance pop up, and lots of things actually.