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Weird cotton looking substance on water surface


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Hi guys, 

Anyone know what this cotton looking stuff is? Its only on the tank surface in a heavily planted tank. Fish are indifferent about it. Worried it might be mould or fungus.


Thanks in advance


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The thing that makes me think its not algae is that its only on the water surface and kind of water resistant as you can see from the water drops on it. No trace of it under the water.

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