The idea is bring the bag water parameters, including salinity, to as close to your tank as possible. You can remove water from the bag and dump it as you're adding water and it will eventually be the same. It just depends on how anal you are about getting things perfect. Also certain livestock can be more sensitive than others. I always measure the salinity of the bagged water and if it's much lower then I spend more time but pretty much everything I've purchased from Calgary stores has measured 1.025 which is what my tank sits at so it's usually a quick process. I wouldn't maintain your tank to match store conditions, set them to ideal levels and adjust new livestock to that.
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