Apr 21, 2013 #1 RoOfDiVr Aquarium Advice Apprentice Joined Sep 9, 2012 Messages 23 Tube worms? It's blowing up! Any guesses? Attachments image-245603271.jpg 140.4 KB · Views: 68
Apr 21, 2013 #2 Rutrag Aquarium Advice Addict Joined Jul 10, 2011 Messages 1,158 Location Richmond, VA My guess is a type of sponge.