So I have a small 10 gallon frag / invert / QT tank where you have to live for a while if you are not a fish. Just a heater, a small powerhead, Prime 16hd and HOB filter. The tank has a film that builds up on the water surface since there is no overflow - I assume the film is protein or fat? I considered adding a protein skimmer, but don't really want more equipment. I am now considering adding a corner overflow to the tank - small - maybe 4x5 inches - and have the filter inlet inside that overflow, and the filter outlet back into the tank. No Sump. The thought being that the organics on the water surface would now flow into the overflow and allow it to be pulled out by the filter. Thoughts? Worth the effort? Thanks