How often do you do water changes? Weekly water changes should be enough to keep the tank clean without the need of a skimmer. To get the flim on the top of water gone, try pointing a powerhead (I'd use a koralia nano powerhead for that size tank) towards the top of the water. The water movement from the powerhead should be enough to get rid of the film.
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One more fish should be ok?, right!!!  - Laurie
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