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I'm a little confused with the logic. Did you put the airstone in just to get rid of the film? What does plant competition for CO2 have to do with this? The air stone will only remove CO2 from the water, starve your plants more, and reduce the oxygen production further.
The film on your water is perfectly natural. It's just bacteria and protozoa. Biodiversity ftw. If it's aesthetically unpleasing, just swish your hand around the surface every morning, or get a very very tiny water pump to create surface agitation.
The film on your water is perfectly natural. It's just bacteria and protozoa. Biodiversity ftw. If it's aesthetically unpleasing, just swish your hand around the surface every morning, or get a very very tiny water pump to create surface agitation.