Your phosphate might have been absorbed into your live rocks.
Manually remove as much algaes as you can reached and Reduce your photoperiod to 7 hrs, increase nutrients export through weekly 20% water change from distilled water or ro/di salt mix, setup a refugium to grow algaes, use algae turf system, phosphate remover like rowaphos or ultraphos, upgrade your skimmer or mod it to be more efficient.
After your nuisance algaes are gone, your Coralline algae will start growing.
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