Can someone ID?

[Ippyroy]

Not sure what this is. It comes off easily with a turkey baster. I haven’t tested NO3 nor PO4 due to battling GHA.

 

[vetteguy53081]

Its turf algae, like bryopsis- this stuff is tough and CUC rarely touch it.
It can be treated with peroxide or fluconasal (flux)
What I found that really takes them down are Ninja Star snails

 

[Ippyroy]

Yay. Can fluconasal freeze? Will it be ok?

 

[Ippyroy]

Never mind. Confused myself. Powder doesn’t freeze. Thanks. That’s what I thought.