After being in the hobby for quite some time, you will develop your own procedure of introducing new fishes to your tank.
Below is my procedure.
1) Switch the tank light to dim or blue.
2) Soak the bag in tank water for 30 mins to equalize the temperature.
3) Drip tank water very slowly into the water bag.
4) After 30 mins or more, transfer the fishes from the plastic bag to a floating breeder plastic container floating in the main tank.
5) Here the new fish will encounter the tank water fully. I also feed them a little so they gain strength.
6) After another 30 mins or more, they are transfer from the floating container to the main live tank.
It may seem a long process but why rush ? The fish is already bought and for you to enjoy and hopefully for as long as possible. Hope that helps.

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