You can easily avoid the stress of PH and salinity difference simply by matching the existing system prior to the water change.
It's already too late now, he's done it. If I had readings that high and my corals looked bad, I'd do the same thing.
If things didn't look like they were dying on me then I would take your approach with smaller more frequent water changes.
Just my .02
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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