Crazy amount of Alk & Calc consumption ... what could be wrong?

Well, calcium and magnesium are pretty elevated now. I'd definitely consider stopping dosing both of them.

You could continue with your alkalinity dosing alone and hope the other two elements get consumed as well and you happen across a point of balance with rising alk and falling calc/mag.

If it were me (and I don't know your tank as well as you do) I'd stop dosing everything for a solid 3-4 days. It feels like something is going on in there and that all the dosing is just adding fuel to the fire. If after two days, your alkalinity is getting towards the danger zone of below 7, you might do some little doses to hold it there.

I can't explain it, but was in the same spot not more than two months ago with a hugely outsized alkalinity demand. Took a few days off dosing and then really eased back into it, and my alk/calc consumption nearly cut in half and is back in line with what you would kind of expect.
 

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