Brown dots algae ID please

[rowenaad]

Hi my tank is 1.5 months old and it just came out of a diatom bloom 2 weeks ago, so these dots aren’t diatoms i can tell.

They started to appear abt 10 days ago only on the rock and grew a lot faster than the purple ones (i think those are coralline algae?). it couldn’t be removed by scraping with a tweezer.

 

[vetteguy53081]

Diatoms and associated with new tanks that are. Completing the cycle. Often triggered by silicates in the water or from ro units