Nov 27, 2013 #1 beernboots Aquarium Advice Activist Joined Jun 14, 2012 Messages 160 Does anyone have a clue what these are and are they ok in my tank?
Nov 27, 2013 #2 Pryzz Aquarium Advice Activist Joined Jun 8, 2012 Messages 182 Looks like a sponge to me. Harmless.