Just wondering why you discontinued the ultrabio? I thought the film was from the ultrabak/ultraminS. The film results from an excess of food that the bacteria aren't using. In order to get rid of the film you need to continue to add bacteria (so they can eat it) and reduce their food.
Just a thought. My feeling on the various issues I had after replacing the stones was that I wasn't adding enough ultrabio to seed them and the tank had a bit of a "crash" that way and I lost a few things.
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