Jun 11, 2020 #1 A Abdullah54321 New Member View Badges Joined Apr 18, 2018 Messages 14 Reaction score 4 Rating - 0% 0 0 0 It has been there for about a month and keeps growing. I don't notice it harming the coral Attachments VID_20200611_021356.mp4 16.3 MB
Jun 11, 2020 #2 Tahoe61 10K Club member View Badges Excellence Award Moderator Emeritus Joined Mar 2, 2012 Messages 13,239 Reaction score 15,708 Location AZ Rating - 0% 0 0 0 Sponge or Tunicate, both harmless.
Jun 11, 2020 #3 OP OP A Abdullah54321 New Member View Badges Joined Apr 18, 2018 Messages 14 Reaction score 4 Rating - 0% 0 0 0 Thanks.
Jun 11, 2020 #4 El_Guapo13 Valuable Member View Badges Hospitality Award My Tank Thread Joined Feb 21, 2019 Messages 1,800 Reaction score 4,235 Location Greater Houston area Rating - 0% 0 0 0 Looks like pineapple sponge. Harmless filter feeder.
Jun 11, 2020 #5 vetteguy53081 Well known Member and monster tank lover View Badges Partner Member 2024 Excellence Award Reef Tank 365 RGB Article Contributor Tampa Bay Reef Keepers West Palm Beach Reefer Hospitality Award Ocala Reef Club Member 305 Reef Club Wisco Reefers Midwest Reefer Fish Medic MAC of SW Florida Rock Pool Reef Keepers R2R Secret Santa 2023 My Tank Thread My Aquarium Showcase Joined Aug 11, 2013 Messages 96,707 Reaction score 215,505 Location Wisconsin - Rating - 100% 15 0 0 Its Poriferan sponge. While harmless can reduce the eco advantage of live rock by overtaking it.