May 4, 2015 #1 The-Russ Active Member View Badges Joined Feb 7, 2014 Messages 116 Reaction score 28 Location Atlanta Rating - 0% 0 0 0 I have these things growing in my sump. Any idea what it is?
May 4, 2015 #2 evolved [email protected] View Badges Excellence Award Reef Tank 365 Expert Contributor Article Contributor Moderator Emeritus AZ FRAG Member Hospitality Award My Tank Thread Joined Dec 16, 2010 Messages 10,633 Reaction score 11,986 Location Phoenix, AZ Rating - 0% 0 0 0 sponge; harmless