Any time you add a new fish, your going to see some attitude from the current fish. I have 2 yellow tail damsels and they are the last in the pecking order. The clown and the Royal Gramma keep them at bay. My Yellow watchman has no issues with them and my Mandarin did not either. It is best to add a new fish with the lights off or maybe just actinics. This lets them sneak in so to speak.
I would try it a few days and see what happens. Getting a fish out is sometimes not easy to do. I don't really like my damsels but they do swim a lot and seem to make the other fish swim too.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,