film on top of water

A few weeks ago I stopped all surface disruption in my tanks in order to preserve what co2 I could from the fish and other processes. I now get a white film on top of my water pretty frequently. Is this normal? Is it a problem? The Co2 levels have increased a bit, and the plants seem to like it but the film bothers me a bit. Also when I remove a sponge from my HOB's and allow them to ripple the surface the film quickly dissapears, but I still get a few bubble nests around the intake tubes and cords.
Dave

Tap water
P= 2ppm out of tap
kh= 4 (I add baking soda kh is 2 out of tap)
no dechlorinator used
amm 0
nitrite 0
nitrate 5-10
dose kcl and florish twice a week
fish (see signature all ae juvies so very light load right now)
temp 76*F

Thanks Bill.

Unfortunately mollies wouldn't last 5 seconds with my oscar and dempsey. and the big tank is the only one that seems to get really bad so maybe guppies eat some of the film also. Either way if it won't hurt anything, I'll manage to get used to it. thanks everyone for you replies.
dave

Thanks Wellsgun, The issue here is that don't want any surface agitation. I am running an AC 500 and an Emporer 400 but have dampened the flow back into the tank in order to retard gas exchange. the film showed up when I stagnated the water. It's a trade off as are many things in this hobby. If I want to preserve my co2, I will probably have to live with the film or do the paper towell thing frequently. But thanks for your input never the less, all thoughts are appreciated.

RTR said:

I need to work on you about canisters and surface scum extractors...but long-term an oscar would consider it another fish toy.

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"When the pupil is ready, the Master will appear".

I am familiar with the existance of skimmers used in salt water, but didn't know there was such a thing for freshwater that would function well. Please feel free to enlighten me. Many of the things I am doing with my current tanks are designed to gain knowledge for the 70g that will be set this fall or winter. The 70 will be a heavily planted, angel fish and ram tank with some exotic (zebra or king tiger) pleco's, and tetra's, cories and maybe some otto's or sae's. It wll also be the first thing people see when they walk down the stairs into my newly finished basement. I had planned to try out cannisters with this tank, as I don't have any remaining large tank filters and will need to purchase new filters when the tank is set. Also my Oscar is currently pretty small and doesn't seem to mess with much yet. The tank he is in has a lot of decor thus far he hasn't taken offense to any of it. My plan was to adjust the decor/ equipment if needed as the cichlids grew up.
dave