Cyano?

[RogueGrown]

Is this the start of it?


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[AlSimmons]

That looks like something else IMO. Definitely keep your eye on it though.

 

[fijisrfr]

Looks like a macro algae


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[RogueGrown]

It's in two small spots that I know of. Being in my sand bed I'm sure it's all over the place.


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[CindyK]

I am new, but does not look like the cyano I've experienced.