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I have a Fluval Spec 5 gallon live planted tank with one betta and a nerite snail. I change water 50% every week and have tested water parameters and all is well, except this white film that keeps forming at the top of the water. I actually use my fish net to break up the white film so my betta can breathe when coming to the top of water. What is the white film? I have tried a simple protein skimmer and I still can't get rid of it. What is the best way of getting rid of it? Many thanks for your help.