Oct 17, 2013 #1 bcpierce86 Aquarium Advice Newbie Joined Oct 16, 2013 Messages 6 Don't know what this is on my rock but it has been growing for a while. Attachments image-2735847748.jpg 193.7 KB · Views: 63
Oct 17, 2013 #2 Dav3 Aquarium Advice Addict Joined Jul 22, 2012 Messages 1,233 Location California Probably sponge
Oct 17, 2013 #3 OP OP bcpierce86 Aquarium Advice Newbie Joined Oct 16, 2013 Messages 6 I also have these sponges growing everywhere. Attachments image-1070492612.jpg 118.1 KB · Views: 61