White Sac

[Digicop]

Any idea what this is? It looks like I am starting to see things growing inside it.

 

[Reefer5640]

Hard to tell. Looks like a sponge possibly.

 

[vetteguy53081]

Its carpet sponge. Although of no harm will only spread further. If you want to eliminate it, inject via syringe either vinegar or air
Pulling rock and exposing to air will also stop it