What is this on the glass??

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It is a new tank which was seeded with filter media. Very low light with just anubias and java fern


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I am not sure, I can't tell well from your picture. No worries though, I know how it goes to try and get good aquarium pictures!
Can you describe it to us as well please?
 
Maybe it is diatoms but do diatoms flow with the water?

I remember diatoms on the glass as just being like a brown slime that washed away

Looks like moving dirt particles attached to the glass

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