The system's old enough that a sudden change overnight means something went wrong with your routine.
You can do another water change or not, but I would not dose anything else until you figure out what could have gone wrong. I would do another water change.
Monitor the parameters, keep them steady. Alk swings are pretty hard on SPS.
Have you always been dosing Probido plus Zeo?
Is anyone advising you on dosing what you are dosing?
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Mitch
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