Jan 29, 2018 #1 me & my baby Active Member View Badges Joined Feb 26, 2014 Messages 467 Reaction score 209 Rating - 0% 0 0 0 This has started to pop up on some of my rocks . Any idea on what it is .
Jan 29, 2018 #2 BoomCorals 2500 Club Member View Badges Joined Mar 22, 2017 Messages 4,653 Reaction score 7,383 Location Milwaukee, WI Rating - 0% 0 0 0 Looks like spirorbid or a tube worm. Harmless.
Jan 30, 2018 #3 OP OP me & my baby Active Member View Badges Joined Feb 26, 2014 Messages 467 Reaction score 209 Rating - 0% 0 0 0 It looks like some kind of algae