Apr 13, 2026 #1 S Sid996 New Member View Badges Joined Feb 23, 2025 Messages 24 Reaction score 9 Location Nottingham What state or country do you live in United Kingdom Rating - 0% 0 0 0 anyone have any idea what this strange white stuff is on my rock ? and should I be worried cheers
Apr 13, 2026 #2 tbrown Cronies #3?? Heathens' Coffee Snob??? View Badges Ultimate Member Reef Squad Reef Squad Leader Excellence Award Reef Tank 365 R2R App User Article Contributor Hospitality Award Rock Pool Reef Keepers My Tank Thread My Aquarium Showcase Joined Nov 22, 2019 Messages 83,237 Reaction score 228,762 Location Peoria, AZ Rating - 100% 2 0 0 Likely sponges or tunicates (I'm thinking tunicates). They're filter feeders and usually not a concern unless they're encroaching on corals.
Likely sponges or tunicates (I'm thinking tunicates). They're filter feeders and usually not a concern unless they're encroaching on corals.