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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Jack the Wong says
That is normally due to excess of food. Fish food normally carries oil. The oil builds up if the food has time to dissolve in your water.
A quick way to remove this film, is to put a paper towel on top of your water for a fraction of second to soak the oil. Do it about 3 times, or until nothing is visible.
For prevention, just feed less, and crumble your food less.
I used to have that in my 30-gallon, until i started to feed a lot less.
:)
Paul S says
the film is probably a sign of over feeding. only feed little bits at a time then see if they eat it all. if they do then give a little more until they are done. then use your net to remove extra..