What am I dealing with here?

[Bhor217]

I have noticed this reddish algae starting to grow in one area in my tank. I cannot tell if they are dinos, a new octo as you can see is dying, but all my parameters are stable and have not been an issue in some time. Any ideas what i might be dealing with?
Alk 8.0
Ca 481
Mg
Nitrates 27.8
Phos .20
pH 7.9

 

[KrisReef]

Almost certainly Cyanobacteria.
Mechanical removal with a siphon hose and a small water change can avoid coral losses.

 

[Potatohead]

If you disturb it, is it dusty, or clingy (like it comes off in mats?)

 

[Bhor217]

If you disturb it, is it dusty, or clingy (like it comes off in mats?)

Dusty

 

[Bhor217]

Almost certainly Cyanobacteria.
Mechanical removal with a siphon hose and a small water change can avoid coral losses.

i have removed it a few times and it comes back in the same place, does cyano do that?

 

[Potatohead]

Dusty

Dinos