I think it would depend on the actual gourami that you bought. Some will be passive while others are not. When you place him into the 30 gallon, be sure to keep an eye on him for a while to make sure that he's not attacking anyone else.
Personally my gold gourami is very mean and he attacks the blue crayfish in the tank. I don't know what he's trying to do, but if he keeps it up I'm sure he's gonna get what's coming to him.
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