Purple Pseudochromis aggression a concern?

[calkrog]

i've had a purple pseudo for about 8 months now, together with 2 different types of gobies, and the pseudo chases the lawnmower around once in a while but i've had no problems. although im sure he did have something to do with the demise of my yellow watchman. but the blue tang chases the pseudo around once in a while and puts him in his place so overall everything seems fine. on the other hand several people have warned me about the aggresiveness of the pseudo.