What the @#&%?? Birdsnest Bubble Growths

[AJ_77]

Just saw this tonight on my frag of pink w/purple birdsnest - anybody know what this could be?



Here's a close-up of the action - can't quite tell if the "bubbles" are hard or soft:



Ca = 370 / Alk = 7.5 dkH / Salinity = 1.026 / Temp = 81. All other corals look normal. Any useful input is appreciated.

(Gonna go try to post this on RC as well.)