It's not hair algae...so what is it?

[GuppyHJD]

I was away from my tank for a month. The autofeeder worked great except my phosphates got into whole numbers.
I now have a green algae that I am not sure what it is. It will not scrub or pull off the rocks.
Once IDed, when my phosphates get back down below 0.10, will this algae pollute the tank as it dies?

I do have some bubble algae in the tank also - I have added emerald crabs to attack this.

Suggestions?

 

[KrisReef]

Ulna, get a tang!