Is it just me... or is the salinity at 1.023 a tad low. I’m thinking more around 1.025-1.026 for corals as 1.023 seems to be more for FOWLR.

I personally have problem when a few time when i fail to mix to my salt. And was doing water change at 1.024. I would said up your salt and see how it react in 24hr.

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Two days for the elegance to detach seems quick....could have come that way from the store. But, a number of your parameters are a bit off...NO3 and PO4 at zero won't make most LPS very happy. If these are true readings up your feeding or dose both if you are confident in doing that. Target feeding as you have done will definitely help. As others have said, your Ca and salinity are low as is your magnesium. Cheers and good luck!