Possible start of Bryopsis?

[BlueBox]

Hello everyone! I recently noticed this green string like algae attached some some of my rockwork. It's pretty stubbornly in place and doesn't pull/brush off easily.

My current tank parameters:

ALk: 7.9 dkh
Cal: ~390-400
Mag: 1180
phos: 0.04
Nitrate: 1
PH: 8.11
Temp: 78 F

I've added my most recent ICP results as well as my current light spectrum just for some extra information.
Based on pictures I've seen other members posting i'm leaning toward bryopsis, however most pictures don't show what it looks like in the early stages.
Any help would be much appreciated!

 

[Webslinger]

Chaetomorpha