I'd hold off on the Mandarin for now, you will need a good pod population before even considering adding one.
Stability is key when it come to this hobby. You don't need a Salinity Probe, just buy a good refractometer. I only test Salinity on the fresh SW before a WC, I'd suggest to keep your Salinity at 1.025.
If you're going to add multiples of the same species, add them at the same time.
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It all started with ............. "Finding Nemo"
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