What kind of lights are you running on your tank? If the nem is moving, something is not to its liking. Flow, lights etc.
My nem moved for the first couple of days in the tank, then settled approx 4 inches from where I originally placed it. My clown jumped in it within a week and is now quite protective of it. My male tries sneaking in when the female is out, then she drives him scurrying across the tank when caught. I'd give both the clowns and nem a chance to settle before worrying if they'll host.
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