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film on water surface

Please help a newbie,

For about a week I have had a white film on the surface of my 55 gallon tank. 
strain it off with a fine mesh net, but it keeps coming back. The tank has
3w/gal fluorescent lighting and DIY co2. It is fairly heavily planted.

I recently began feeding the fish (11 small ones) dried krill. Could the film
be oil from the krill?