What kind of Alge do I have

[Richards Aquarium]

So is this alge good or bad I have green and purplish. I'm 3 months inn. I still get Brown alge growing on sand which gobie takes care of. But I get alot of brown on back glass and spots on front glass.
Zoom inn on picture to see rock alge I just cleaed all glass. Any suggestions I do like it on the rocks. Thank you in advance

 

[EeyoreIsMySpiritAnimal]

Is it hard or can you blow it/scrape it off?

 

[Richards Aquarium]

It can be scraped off with a tooth brush on the glass. I haven't touched the rocks I don't want to they look cool. As I'm looking at my tank right now the spots are coming back on the back acrylic and I just cleaned it about 7 hours ago. The alge on back acrylic is a brown maybe it's hard to tell its painted blue. The brown dots I get on the front acrylic is a little tough to get off I have to scrub with the brush pretty hard with pressure they are definitely brown. This is a close up of my rock.

 

[JGT]

It’s actually kinda pretty. Just sayin.

 

[Richards Aquarium]

It really is pretty very cool looking. Seeing it in person is better. Picture don't do it justice. Ty. I want to keep that alge and get rid of the glass alge.

 

[JGT]

Magnetic algae scraper. Gotta use some in elbow grease.