Jul 13, 2019 #1 J Joe Stafford New Member View Badges Joined Mar 30, 2019 Messages 8 Reaction score 1 Rating - 0% 0 0 0 Curious what this substance is? Its on the underside of a rock. Aquarium is roughly 4 months old.
Jul 13, 2019 #2 KJ Lone Wolf View Badges Reef Squad Leader Excellence Award ETRC Member Hospitality Award Joined Dec 14, 2011 Messages 22,319 Reaction score 113,207 Location Tennessee Rating - 0% 0 0 0 Sponge harmless! Last edited: Jul 13, 2019
Jul 13, 2019 #3 R road_runner Valuable Member View Badges Joined Jan 6, 2017 Messages 2,325 Reaction score 2,293 Rating - 0% 0 0 0 Look like a sponge. Its harmless..
Jul 13, 2019 #4 OP OP J Joe Stafford New Member View Badges Joined Mar 30, 2019 Messages 8 Reaction score 1 Rating - 0% 0 0 0 Thank you! So obviously just leave it be if its harmless?
