Getting Your New Fish Home
When purchasing any fish it is good practice to find out from your supplier what the water parameters are at the shop so you can try to get yours as close as possible, which reduces the risk of fish losses in the early stages.
Float the fish in their bag in your aquarium for between 15-30 minutes to allow the water in the bag to get close to the water temperature in your aquarium.
On opening the bag, add about 20% volume of the bag from your own aquarium water to the bag every 5 minutes until full. This allows the fish to get used to the new water and temperature without stress or shock.
Slowly tilt the bag and allow the fish to swim out into their new environment. If you don't want to add the shop's water to your aquarium, before releasing the fish remove the bag from the water and drain off as much of the water as you are able to while still keeping the fish covered, then return the bag to the aquarium and release the fish.