reddish coating on the glass

[stonefox]

There has been a remarkable reddish coating on the inside of the glas in one of my aquariums. Coming soon again when I removed it. What is it and what causes it and how to remove it? Se attached file.

 

[Adamski]

Can't see a picture but sounds like cyano


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[stonefox]

If it is cyano, what can I doo to remove it .?.

 

[Adamski]

Try to use RODI water if you aren't already. High nitrates and phosphates will cause growth. Reduce them and the cyano won't be able to feed.


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[lstimpy]

Is it purple coralline algae?


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[54seaweed]

I have to scrape the glass daily Coraline algae builds fast , its become a daily chore
wait till it hits the power heads now that's not fun to clean up