What is this Pus Bubble Blob

[TheSkipper]

Seemed to form over night. Its about the size of a dime it has formed around a pencil size rock finger. Should I pull the rock out and scrub it off? Thanks everyone here is always of great help? I have a few Pepermint shrimps - they have not touched it.

View attachment 9118

 

[Smiley]

looks like a sponge of some such.......leave it...

 

[Cake_Boss]

looks like a sponge of some such.......leave it...

+1

 

[TheSkipper]

Thanks2 for Sponge - I will Let it Be and see what happens. Stay tuned.

 

[Rebel]

pineapple sponge, I think. Good .