Apr 9, 2020 #1 3rdMoon Community Member View Badges Joined Oct 30, 2019 Messages 91 Reaction score 31 Location Austin Rating - 0% 0 0 0 Found this and two others like it (smaller ones) on my live rock today.
Apr 9, 2020 #2 cloak 2500 Club Member View Badges Excellence Award Joined Apr 25, 2015 Messages 2,972 Reaction score 2,114 Location Stockton, CA Rating - 0% 0 0 0 Is it hard or soft? If it's hard then it might be a Vermetid snail.