Another case, close relatives: Muicella plectana, very similar to blueberry, only in miniature. Both belong to the same family: Acanthogorgiidae. Same surviving chances.

Same type of decline, only slower, 3 months (in the tank, where dendronephthya and other NPS corals were doing much better):

Also was fragged very late, when there was nothing to lose. All survived, already for 6 months, main colony still ragged looking, with quite active polyps:

But frags, if were cut down to the healthy tissue, didn't decline:

When damaged tissue was left, was some die off, then stopped and hair algae took hold - without killing the coral:

Both healthy and hair algae covered frags are within 2" from each other.
Is survival and type of declining genus specific, even within the same family?
Do you have other Acanthogorgiidae gorgonians, how are they doing?