there are skimmers small enough if you decide to use one, lets let one of the nano keepers chime in with there recommendatiosn on that.
now the film is normal, its organics that get caught on the surface of the water. on a tank liek that the best way to hande it is with regular water changes, as i dont think you can get any type of surface skimmer in there. if its reall bad between water changes you can lay a piece of paper towel, or cheese paper on there quickly to absorb it. but usually weekly water changes will keep it in check
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