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Might be cyanobacteriaWhat is this and what to do about it. Thanks!![]()
Ya, After some youtubing I'm pretty sure it's Cyano. Not sure what I'm going to do about it, it's only on the sand and I can pretty easily remove it so far.Might be cyanobacteria
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Cyanobacteria has existed for millions of years and is present in every natural body of water (and many "unnatural" ones including our tanks).Ya, After some youtubing I'm pretty sure it's Cyano. Not sure what I'm going to do about it, it's only on the sand and I can pretty easily remove it so far.

I'm coming up on 4 months. I have added no chemicals. I would say it's mostly in a low flow area.Cyanobacteria has existed for millions of years and is present in every natural body of water (and many "unnatural" ones including our tanks).
It is always present but can gain a foothold when conditions are right -- no competition from other bacteria, archae, algae, etc, as well as chemical/nutrient imbalance
Almost all aquariums will see some cyano at one time or another.
So...
How old is your tank?
Have you added chemicals to remove other algae recently? (This can result in cyano due to the imbalances mentioned above)
Cyano often thrives in lower flow -- how is the flow where you're seeing it?
Finally, it's absolutely not the end of the world! Proceed slowly and thoughtfully (and avoid things like Chemiclean that can bottom out nutrients leaving the door open for dinos). It's very likely that the cyano will go away on its own without much more intervention from you (it did for me).![]()
Increase flow to that area and wait it out. It's a normal part of the uglies and not at all unusual in a 4 month old tank.I'm coming up on 4 months. I have added no chemicals. I would say it's mostly in a low flow area.

