From everything I've read, this stuff is more common in newly established tanks due to high silicates. My tank has been running for over a year and I still can't get rid of it. This makes me think that my tap water is the problem but how do I fix it? Is is best to have a phosphate/silicate remover in my canester filter? should I get a nerite and otto cleaning crew? I've seen several threads from people having the same issue but no one has come up with a solution. If someone has had success battling this stuff please let me know how because I am tired of my tank looking like pond scum!