Jan 30, 2014 #1 Iceman72 Aquarium Advice Activist Joined Sep 12, 2013 Messages 165 I was checking out my tank and noticed these inside the dark hole in a piece of base rock.
Feb 1, 2014 #2 fort384 Dividing by 0 Site Team Joined Nov 23, 2008 Messages 13,931 Location Illinois Looks to be an unopened zoa to me.