new growth need info please

[jackstir34]

Hi all! this stuff is growing out of control, not really that unsightly but want it identified so I can research it.

 

[Travis Dragan]

do they recede into the rock when disturbed?

 

[islander84]

Hard to tell by the pic but could possibly be some sort of sponge, or some kind of crazy worms...... can you post a couple more pics?