Sep 28, 2013 #1 C Cliff Reefing newb Location Western Montana Anyone know what this is? Attachments image.webp 140.1 KB · Views: 330
Sep 29, 2013 #2 fastrd400 Reef enthusiast Location Bay Area, California Just a guess, but looks like bubble algae.
Sep 29, 2013 #4 ErinCahir Reef pro Location Englewood, CO Bubble algae for sure. You can also CAREFULLY pull it off the rock. Make sure not to pop it.