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White swirls on glass?


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Every so often, these oddly-shaped little spots of white show up on the inside of the glass of my shrimp/betta tank. It doesn't seem to be causing any trouble to the animals, and usually the spots will just go away on their own and pop up somewhere else in a few weeks.  Can anyone tell me what this is?


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I get these in tanks with newer wood especially mopani. I’m not sure exactly what those are I suspect just a bacterial colony. They come and go in mine as well. After 6months to a year from the time I introduce the wood I never see them. They have never caused harm in my tanks. 

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