Diatom bloom producing oxegen?

[allie_san]

My tank is about 5 weeks old now and it's been going through the same process for about a week and a half. I assumed it was normal after doing some reading..Brown algae over the sand.. Some air bubbles rising and a bunch still trapped under sand.

I also noticed some little hairy green algae growing on the walls, not sure if that's something I should be concerned about?