Are we talking about halichoeres chloropterus? If so I've heard some are fine with anything but again heard of larger individuals that were extremely aggressive to the point of killing other fish.
Is it still small? It tends to be when they are mature that problems occur. What else does your son have in the tank?
you might be better off buying something with your son but start looking at wrasse species that are generally peaceful but can also stick up for themselves a little, something like a melanurus wrasse.
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