I acclimate by adding 1/4 cup to 1/2 cup of water at a time, over 30 to 60 minutes. But if there were a large salinity difference I would acclimate for longer.
There is something about ammonia chemistry that makes it more toxic at higher pH's, it is possible this had something to do with the death of this fish if the pH went up in the bag during the acclimation. Anyway this is just a thought.
It is also possible the tang died from CO2 toxicity, this would go along with a low pH ie. higher CO2 in the bag with the fish would lower the pH of the water.
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