There are a couple of methods to correctly acclimatise your corals, but the floating method is more than sufficient.

FLOATING METHOD:

Switch off your tank lights to prevent stress from sudden exposure to bright lights.

Remove the bag containing your new corals from the poly box and place in your tank/sump, allowing it to float in your tanks water for approximately 15 minutes. This will provide enough time to bring the water in the still sealed bags up to your tanks water temperature.

After 15 minutes, open the bag and roll up the top of the bag, allowing easy access. (Handy tip: when rolling up the top of the bag, try and create an air pocket as this will allow the bag to continue floating in your tank/sump). If the coral pieces are to large for the bag to float, place the bag in a bowl. Next start adding small amounts of your tank water to the bag.

Repeat this process every 5 minutes, until the bag is almost full. Discard half the bagged water (not in tank) & repeat the above process.

You corals are now ready to be placed in your tank.