I had a tank do this to me once said:Good to hear. Wasn't really planning to touch it now. Been like this for about 3 weeks or so. Thanks.
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That is definitely cyano bacteria. Is the flow in your refugium very slow? For now said:I guess it's slow. I thought about scraping it off with next water change but as you stated, no harm right now. I will keep an eye on it though.
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