by cleaning out the algae before dosing vibrant/saves your reef a chance from loss by rotting algae in tank/ and by cleaning out the sandbed so there's no clouding in it feeding gha
then the lighting/heavier blues not whites
then the clean up crews
and in the clean v invaded condition, dead last, check parameters. how nitrate and P measure now don't matter.
a 30 page work thread on gha cures has been kicked up just below this one see those options, they're full tank cleans and we listed vibrant-caused losses on the last page, its risky to use it in an invaded reef. its less risky to use it in a clean reef, to hopefully maybe prevent growback.