Very solid advice given so far.
When we bring in a fish shipment, we prep our incoming system in advance.
Depending on what supplier we use, we know what salinity to expect. We also have a rough idea what temp they come in at (depending on the time of year) so we set our chiller on that system to match the fish shipment.
We then use a CO2 tank to drop the system PH. We have a controller set to increase PH 0.1 for every hour that passes until 8.0 is reached.
Once all the fish are properly acclimated and looking good, they get transferred over to the fish system for sale.