ID help, Parasite or Algae

[cathshoe2]

work at an ocean front boutique in Oregon.
We had this come out of one of our oceanfront outdoor tubs. I need to make sure this is Algea and not some parasite growing in the tub?
Did this come from the ocean or our local water?

 

[vetteguy53081]

work at an ocean front boutique in Oregon.
We had this come out of one of our oceanfront outdoor tubs. I need to make sure this is Algea and not some parasite growing in the tub?
Did this come from the ocean or our local water?

Images are distant in the pics but appear to be algae