surface scum

trying to solve this problem and it will not go away. Nero 3 wave maker added RFG Added. (Both pointing to surface) Sump modification. Overflow modification. NOTHING WILL SKIM THIS SURFACE! overflow is working as it should.

So I noticed yesterday that there was a film developing on the surface of the tank and when I looked it up I found that it was called surface scum. I’m new to the hobby so I didn’t know about this beforehand and I was wondering what I should do about this. I noticed my clownfish pecking at it...