Well, the first step is to quarantine that new fish for 6-8 weeks to ensure it won't introduce a disease or parasite that will wipe out the rest of your fish.
Then you get an acclimation box, which is nothing more than a clear acrylic box that allows water to flow through. Your existing inhabitants can see and smell the new-comer but not harm him. It may take a day or two or three until they get used to him. It takes time.
Dave.M
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My Gawd! It's full of corals!
Current Tank Info: None. Nil. Zip. Nada.
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