Dec 10, 2017 #1 jmt1030 Active Member View Badges Joined Nov 28, 2016 Messages 163 Reaction score 69 Rating - 0% 0 0 0 Any idea what these are? I’ve noticed them around my tank and they seem to be reproducing.
Dec 10, 2017 #2 Crabs McJones I'm so shi-nay View Badges Excellence Award Reef Tank 365 Article Contributor Moderator Emeritus Hospitality Award Reef Tank 365 Boss Wisco Reefers My Tank Thread Joined Jul 24, 2017 Messages 27,806 Reaction score 139,920 Location Wisconsin Rating - 0% 0 0 0 Looks like sponges. Harmless filter feeders. Sign of a healthy system