It is more safe just to temp acclimate, and I do that with other fish also. When shipped, the bag accumulates ammonia, no matter how well shipped, but the CO2 build up in the bag keeps the pH low enough that the ammonia isn't as dangerous. As soon as the bag is opened, the pH shoots up, making the ammonia even more dangerous, so it is best to remove the fish as soon as the bag is opened.
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