Keep the lights in the room low and make sure the AQUARIUM LIGHTS ARE TURNED OFF. The darkness will help keep the fish, coral, or invert relaxed.
Float the bag in the aquarium for fifteen minutes to allow the temperature in the bag to equal the temperature in your aquarium. Now here comes the most important part! Lift the bag out of the water, and place the bag's contents in a hang-on tank specimen container. Take a length of airline tubing, and tie a loose knot in it. Place one end in the tank, and siphon out some water. Then place it in the specimen container. (There should be a very slow drip) Keep doing this until the amount of water in the bag has doubled. You are acclimating the fish, coral, or invert to your aquarium conditions and this process is very important.
Now you need to discard 1/3 of the water from the bag into a sink or glass, anywhere but back into the aquarium. DO NOT EVER POUR WATER FROM THE BAG INTO YOUR AQUARIUM. Next, repeat the above process until the water is back to its original level. Next, remove the specimen from the bag and place it in your aquarium.
VERY IMPORTANT: KEEP AQUARIUM LIGHTS OFF FOR AT LEAST THREE HOURS AFTER YOU PLACE THE SPECIMEN INTO YOUR TANK. IF FISH OR INVERT IS NOT MOVING, LEAVE IT ALONE. IT SOMETIMES TAKES TIME FOR A FISH OR INVERT TO RECOVER IF IT IS IN SHOCK. DON'T PUSH IT AROUND TRYING TO GET IT TO SWIM. LEAVE IT ALONE FOR AT LEAST 24 HOURS! CORALS MAY TAKE UP TO FIVE DAYS TO EXPAND OR OPEN.
Then again some people just cut the bag drain the water and throw them in, and you know whats funny, that can work too.
Thomas