I have had the 2.5 gallon tank with one fish in it for one year. A couple days ago I noticed a very thin, clear film on the top. When I touch it, it doesn’t feel like anything at all – but I know it is there because it is catching air bubbles and the water is not circulating at the surface. I did a partial water change two days ago – and the clear film is back today. What’s going on?
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