Mar 12, 2019 #1 J Jameseywayney Community Member View Badges Joined Nov 27, 2018 Messages 45 Reaction score 51 Rating - 0% 0 0 0 Has anyone seen this before? Its a weird grey slime looking stuff beside my hairy mushroom.
Mar 12, 2019 #2 reef lover It's a reef thing.... View Badges Excellence Award Reef Tank 365 Hudson Valley Reef Keepers Hospitality Award 518 Reefers My Tank Thread Joined Jan 1, 2013 Messages 14,296 Reaction score 44,612 Location new york Rating - 0% 0 0 0 Sponge. Nothing to worry about .