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Is this Cyano?

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On 12/24/2023 at 5:27 PM, tike said:

Definitely cyanobacteria, I have this black form of it in the past. I would cut back on adding nutrients for a bit and increase water changes to once a week. Give it a month and see if that helps clean it up.

I've never seen or even knew that there was black version. Do you know what causes the diffrent colorization? Is this version normally orderless?

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Can cyanobacteria be black?
How to Get Rid of Blue-Green Algae in Freshwater Aquariums ...
Blue-green algae (BGA) is not actually an algae but rather a cyanobacteria – a very diverse and resilient group of bacteria that uses photosynthesis like plants. In freshwater aquariums, it's known for its vivid blue-green color, but it can also appear in shades of brown, black, or even red.
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