Oct 21, 2012 #1 Arran walker Aquarium Advice Apprentice Joined Jun 28, 2012 Messages 35 Iv had an external filter running for a couple of month and theres white stuff forming all inside the tubes, is this bb or just some type of algae?
Iv had an external filter running for a couple of month and theres white stuff forming all inside the tubes, is this bb or just some type of algae?