3 day blackout , should I leave fuge light on ?

When I do blackouts(been numerous lately as I've been battling GHA for nearly a year now) I leave my fuge light on 24/7 to help with the eventual drop in PH.

When I bring my lights back on, I start with just a low level of actinics for 9 hours, then proceed with normal light after. I've yet to have any issues with my corals.
 
I have a hell of a time keeping alk up, I'm even dropping kalk.

I'm
Gonna pick up a phosphate test .. I ran out.

That was my plan for lights
 
How long should I wait to do a water change after lights come back on ?
I know everyone said not to do a water change while battling dinos
 
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