Bryopsis?

[Sod Buster]

Just take an in focus pic and post it. The videos are to busy for a zoom in. Looks like GHA with a touch of cyno to me.

 

[dwolson]

Just take an in focus pic and post it. The videos are to busy for a zoom in. Looks like GHA with a touch of cyno to me.

 

[Sod Buster]

The slime darker spots look like cyanobacteria to me. It's hard to tell under the blue lights. It will attach to the GHA and make a dreadlock looking thing that is purple with air bubbles. I'm looking at the pic on my phone. Your coralline algae on the back glass is light pink. Cyno is darker purple.