Jan 22, 2013 #1 Nisburgh Aquarium Advice Apprentice Joined Dec 19, 2012 Messages 12 Location Stillwater, OK Hi. Can someone please tell me what this is and the effects it will have on my ecosystem! Thanks! Attachments image-3147861266.jpg 115.7 KB · Views: 54
Jan 22, 2013 #2 Wizard4s Aquarium Advice Activist Joined Dec 9, 2011 Messages 117 Looks like some sort of sponge