Curious: how often do you clean your ATO tank?
I run an air stone in the tank but no other movement. I was looking in there this morning and noticed there seems to be a layer of scum on the bottom of the tank. I've recently been having some rising nitrates and I'm wondering if maybe this is part of it.
I run an air stone in the tank but no other movement. I was looking in there this morning and noticed there seems to be a layer of scum on the bottom of the tank. I've recently been having some rising nitrates and I'm wondering if maybe this is part of it.


