Surface film – Simple Solution
I wish I could remember who got me thinking along this line (so I could give credit to) but I have a very simple solution to filtering off surface film. Take a normal 2” diameter Python gravel cleaner and remove the hose. Pick up two suction cups (I got mine at Wal-Mart) and drill through the side of the vacuum tube to place them one high and one low. Now turn this upside down and place the open end up about ½” under the water surface. Stick your filter pick-up inside of that and run your filter as normal. The majority of the filtered water will come in from the open end at the bottom where the hose was but a gentle flow will also come in the top polishing off the surface.
I plan on removing mine and placing some slots on the top so performance will be the same regardless of water level.