Chaeto growing purple?

[Giants13]

Looks like i might have cyano growing on my chaeto in my refug. should i worry? will it go away?

 

[MizTanks]

What lamp are you using?

 

[Giants13]

9w LED

 

[Dan_P]

Here are a couple things to consider.

Weak macro algae growth or dying algae may provide a home for cyanobacteria growth.

In addition to light, vigorous water flow may be needed to stimulate strong growrh in macro algae.

You might just need to increase flow in your chaeto area with a power head.