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I had a similar issue when my DIY ALK dripper broke and dumped plenty in ATO. Calcium was fine but ALK was just as high. I tried a few partial WC and went down a little. Eventually I just waited until it was absorbed monitoring CAIL and ALK weekly. No ill affects on critters.
God luck.
Black out over.
Sand looks clean, started up UV.
Waiting for Hippo tang & engineer Toby to come out.
Only two fish i cannot find.
Will see how corals looks tomorrow when lights come in.
Matt, think return pump is not needed in this situation and may draw more power. I would say the heater and power head and maybe get more life out of the backup.