Get it eating first in the nano or the sump of the 120g for a week or two. Once it is accustomed to the water and food, put it back into the main tank. It will get attack but shouldnt be more than a couple of hours. After the initial beating to sort out the pecking order, everyone should fall into their places. This has worked for me with almost all types of fish. Make sure you don't have a weak heart if you plan on watching the drama play out.
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