Nov 20, 2021 #1 S saynomoore New Member View Badges Joined Nov 20, 2021 Messages 9 Reaction score 7 Location washington state Rating - 0% 0 0 0 I bought this rock and this was on it..
Nov 20, 2021 #2 OP OP S saynomoore New Member View Badges Joined Nov 20, 2021 Messages 9 Reaction score 7 Location washington state Rating - 0% 0 0 0 I have been looking into it, could it be a Mycale laevis (icing sponge)?
Nov 20, 2021 #3 jgirardnrg Valuable Member View Badges My Tank Thread Joined Oct 9, 2019 Messages 1,590 Reaction score 2,413 Location Berlin, CT What state or country do you live in Connecticut Rating - 0% 0 0 0 NO idea but it does look like some kind of sponge to my eye.
Nov 20, 2021 #4 Tamberav 10K Club member View Badges Excellence Award Wisco Reefers Fish Medic Joined Jul 4, 2014 Messages 10,780 Reaction score 16,238 Location Duluth, MN Rating - 0% 0 0 0 Sponge. I don't consider them bad... although some can grow fast. I would leave it.