What is this?

[Redneckreef90]

So I am 4 days into fallow because of either ick or velvet. I have this brown algae on my sand bed. It was there before but it is heavier now that there is no fish in the tank. What is it and how can I get rid of it?

 

[twilliard]

Is it forming air bubbles?

 

[Redneckreef90]

Is it forming air bubbles?

Yes

 

[twilliard]

Cyanobacteria more than likely

 

[Redneckreef90]

Cyanobacteria more than likely

How do you get rid of it.

 

[twilliard]

How do you get rid of it.

Here is a good start
https://www.reef2reef.com/threads/back-at-it-peroxide-vrs-cyanobacteria.241002/

 

[Redneckreef90]

Here is a good start
https://www.reef2reef.com/threads/back-at-it-peroxide-vrs-cyanobacteria.241002/

Thanks

 

[Salty1962]

Cyanobacteria more than likely

+1, bubbles are a sure sign