What is this algae?

Cdavis66

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Hello my tank is nearing 3 months old and i have a green algae which I am assuming is fine since other people are having the same algae in new tanks and am just wondering what this other algae is.

The full tank picture you can see down by the Zoas that the algae is not too thick. Then I left my tank for the weekend and my Dad was feeding the tank I came back and the small rock the Zoanthids are on was covered by a darker green/brown algae. Could this be diatoms? There have not been any bubbles pointing towards Dino’s.
My phosphates were up to .11ppm last night so I put some phosphate remover into the system. Everything seems happy I am just wondering what this could be for a future reference.

If you need any other info my tank thread is linked. Thanks!

Also note that the zoanthids are always open during the light but I put 2ml of hydrogen peroxide in right before the pics.

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