Rates - 0 ppm nitrites 5 ppm? Did something die recently?
Also 3 months to fully stocked from a scratch tank is really soon.
If nothing is showing distress, just hope it's testing error.
Also, never add store system water to your tank. Store system water can carry many pests/pathogens. As well, when adding from a fish only system, a lot of the time they use meds/chemicals in those systems (when they operate separate of any coral systems) and the addition of those chems can be particularly deletrious in a reef system.
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