How do I remove the film from my fish tank?
How do I reduce biofilm in my aquarium?
The most effective (and easiest) method of preventing biofilm buildup is using a surface skimmer. Skimmers used to be a “saltwater-only” item, but in the past decade the industry has learned that the biofilm buildup can be bad for freshwater tanks, as well.
How do I get rid of the white film on top of my fish tank?
You can buy a suitable lid, remove the film manually, use a surface filter or introduce animals that feed on the biofilm into the aquarium. Mollies or snails will literally eat the problem.