Translucent mucous looking sack at base of cabbage coral

[1desertbrat]

Translucent mucous looking sack at base of cabbage coral. The coral seems happy and healthy. 1st pic is the issue. 2nd video taken later same day when lights were on. Is this an egg sack for something or perhaps a bacterial infection? Thoughts? The coral is huge and magnificent. I have had it for several months and have never noticed this before.

 

[reefman]

not clear enough to get a positive id, but my guess would be sponge.

 

[Timfish]

My vote is sponge also, very beneficial. Looks like there's some pineapple sponges also.