Crazy algae growing up so fast

[seablsckstorms]

This algae have been growing so fast and I’m tired of cleaning rocks manually every 10 days I don’t have time for that t and my tank looks really dirty, anyone knows how to kill this algae? Thanks

 

[Imrahilwjz]

I like sea urchins

 

[vetteguy53081]

This algae have been growing so fast and I’m tired of cleaning rocks manually every 10 days I don’t have time for that t and my tank looks really dirty, anyone knows how to kill this algae? Thanks

Is this tank at or near a window?
Are you by chance using tap water or tap water for topping tank off?
What is your phosphate level?

Seeing no coral on this rock, I would place it in a container of tank water and pull off as much as you can by hand and scrub the rest with a firm toothbrush and some 3% hydrogen peroxide.
Return to tank, reduce white light intensity and number of hours of white lighting and add some snails such as :
Astrea
cerith
turbo grazer
trochus

A Pencil urchin

8-10 Caribbean blue leg hermits

Another cause is overfeeding and lack of maintenance.