Ammonia build-up in shipping water only applies when the animal has been in the bag for a while (say 12-24 hrs). For locally bought fish, ammonia buildup is not an issue. Regardless, I'm unclear why the above suggestion mitigates ammonia buildup? Since you are still using the shipping water, and it's exposed to the air (thus converting any ammonium to ammonia) I fail to see why it's any better. If you must adjust for salinity, have some ammonia neutralizer on hand.
Best approach, without exception, is to use a quarantine tank and adjust it to the salinity of the incoming water.
This was sort of my thoughts too. I don't see the use of Prime mentioned much in SW, where it's pretty much a staple in FW. I was also wondering how ammonia could build up so fast between 30 minutes to 120 minutes..
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