I've been seeing a white film form on the water surface of my tank a few days after water changes. I've been reading that it's basically dust, organic matter, and a side-effect of the water conditioners. I've also read that increased agitation of the water surface would help break up the film and get the particles underwater for the filter to suck them up. I know that it's not hurting the fish, but it just looks icky, and supposedly it decreases oxygen exchange between the air and water (I think that's just speculation though) Options range from just scooping out the film, surface skimmers, increasing the water flow through the filter to using bubblers and air stones to agitate the water.
Scooping it out by hand - I'm lazy.
Surface skimmer - how would that work for freshwater aquariums? I only saw them in association with saltwater aquariums to remove proteins. Are any made for freshwater aquariums?
Increasing current - Danube no likey, so out of the question.
The bubbler seems to be the low-cost, low-labor way to go, but I was just wondering how agitating the water surface would affect my little betta Danube and his bubble nests. I created a very low current zone in the tank so he can hang out there and create his bubble nests and that's where the film is occurring. There is no surface film around the filter outflow zone of course. I don't know if he'll still be able to make his bubble nests with the air stone creating all that surface disturbance in the area. Has anyone had any experience with this?