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there is a weird metallic film on top of my tanks water what is this? after every water change it goes away for about an hour but comes back again. it is an open top tank with fake plants and gravel it houses zebra danios and snails.
 

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there is a weird metallic film on top of my tanks water what is this? after every water change it goes away for about an hour but comes back again. it is an open top tank with fake plants and gravel it houses zebra danios and snails.
Protein scum and fish food oils.
Surface agitation so it gets sucked into a filter.
Lift it off with a paper towel.
Skim it when vacuuming.

I can also be aloe if you are using a de-chlorinator that "protects the mucus on the fish".
 
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