Weird thing going on between a Yellow Tang and a foxface

[Kevin McG]

I have had a Foxface Lo in the tank for quite some time and today added a purple tang and 2 yellow tangs. The foxface seems to be bugging the 2 yellows tangs. He is not chasing or pulling at the fins but is following them around and mouthing the sides of the 2 fish. The foxface isn't bothering with the purple at all so I am thinking it may be the color of the tangs or something.

Is this anything to worry about?

 

[Gobie]

I had the same experience I think it is color, it will stop after a while.