Help identify this algae

[dwfain]

Have this algae growing on a rock next to an anemone and don't know what it is. Something is eating it but I am not sure what. It looks too

dark to be coralline. Can some help please?

 

[a.t.t.r]

Cyanobacteria. Most likely not being eaten just either walked on or dying back when the lights turn off.

 

[WheatToast]

Does it brush off easily?

 

[dwfain]

I have not tried to brush it off yet. Should I do that? Would that help it to spread? Should I be worried about this or just let it be?

 

[WheatToast]

I have not tried to brush it off yet. Should I do that? Would that help it to spread? Should I be worried about this or just let it be?

For identification:
Red Cyanobacteria should brush off.
Red Peyssonnelia and similar algae should not.

 

[Uzidaisies]

Siphon it off