oily white film on water's surface

I set up my new 75 gal tank about a month ago. It cycled pretty quickly (without ever developing any noticeable ammonia levels) since I used some of the water from my old tank. Only after couple days the tank was up and running I noticed a white film covering the water's surface. I thought it was just a temporary thing so I didn't pay much attention to it. It has been 4 weeks now and the film re-appears every time after I try to scoop it from the water's surface. Like I said earlier, it has whitish color with oily appearance (kind of like if you spilled an oil into the water, but white). Anybody knows what it is and how to get rid of it?
Water condition:
PH - 7.6, temp - 77/79F, water hardness - 9 dGH (6dKH).
Set up: 404 Fluval canister filter; and 1140 Penguin powerhead connected via 1" tube to one plate from my old undegravel filter (plate covers approx 30% of tank's floor).
I don't know if this is related (probably not), but my newly purchased australian rainbowfish started developing ICK.
Suggestions anyone?

Thanks for your suggestions, but I'm not sure if they will help. I have a lot of water surface movement from my powerhead (pointed up) and the filter itself. Today I added another filter (it's good to keep old stuff around, lol). I'll see if it helps.
As far as trying the tissue to soak it in, I tried that too but it re-appeared the next day.
I hope it will go away. I had fish for many years now, but I have never seen anything like this before.
Once again, thank you for your help. If you find or hear something else about this issue, please let me know.

Robert

No I don't have CO2 system hooked up. But from what I've read on some other websites and forums is that it could be caused by excessive fat in fish's diet. Everybody is telling me to improve the water agitation or add a protein skimmer. Skimmers are big and ugly so instead, I added second filter. Right now there is no "dead" spots on my water's surface. I will let you know if it helped.

Adding another filter helped. I see the difference after having it on for only one day. I guess it was the water agitation issue afterall. Now I need to figure out how to do it without using two filters. My old filter is huge (over the tank type) Emperor. Maybe I'll just get something smaller or will add another powerhead on the other side of my tank. Anyway, thanks to all for the help. Now I have to get rid of that ich (that should be piece of cake, lol).