[Sk8r]

This is relative to Coral Rx, a well-reputed dip: and you can modify this according to size, brand, etc. While corals are not as fussy about salinity as some creatures, be sure your salinity matches within .001. It's nicer and more polite.
When you receive your new coral, before you open the bag: have two 1 gallon buckets of salt water of the proper salinity. Plus have a Maxijet 400 pump ready in the bucket you will use for the dip; plus latex examination gloves, and a magnifying glass.
Shake the bottle of dip thoroughly. In the case of Coral RX, add 20ml or 4 capfuls of liquid to one of your 1 gallons (3.8 liters) of saltwater and mix thoroughly: follow directions on whatever dip you are using and mix well using the pump. Keep the water moving.
Open the bag and place the new coral fully submerged in the coral dip. Do NOT blast it with the pump output. If you cannot avoid that, then cut the pump off and just wave and rotate the coral in the water for the whole time, holding it in your hand, to be sure the dip reaches all areas of the coral for long enough to work.
Keep the coral submerged in the dip for 5 to 10 minutes depending on size and complexity of coral.
Then remove coral and put in bucket #2, with just the plain salt water.
IMPORTANT: Discard the coral dip. [Do not reuse the coral dip even immediately: a dead parasite may release toxins. Make a new bucket for your next coral, if you have more than one.] Rinse the dipped coral with clean salt water in the second, plain salt water bucket before moving the coral to your observation tank, which should be within .001 salinity of the water you have been using. Look your coral over very carefully with the magnifying glass. Do not worry about having a coral out of water: they survive this handily. But if you have an lps that is partly extended, turn it upside down and gently rotate it to encourage it to retract before removing it from the water.
Never, ever, ever add any coral dip to your tank.
Leave your coral in observation for a week, and examine it from time to time using the magnifying glass. A coral does not critically need light for that period---4 days without light is no big deal---but place it low in your tank when introducing it back to a high-light tank and move it up gradually.