Salt water fish what to add?

Hello, First I want to say I'm a beginner. I'm looking to add more fish to a tank but I'm not sure if it should be done although I really want to. It had a Domino Damsel that terrified all the fish (killing a few) I finally got it out :) These are the fish in a 250 gallon tank as of now...Yellow Tang, Nigger Trigger, Hawaiian Spotted Puffer, Parrot Fish, Heniochus Butterfly, Cinnamon Clownfish, 2 False Percula Clownfish, and 2 Green Chromis. I really want to get a flame hawk but i don't think that its a good idea right? So what else can I add. I can't really add anything else than fish because they all seem to eat what ever grows on the live rock. What about a spider starfish? I think it had one but it died. This isn't my tank I'm a local college student and take care of the tank for the university. Dean asked me to look into the possibility of adding more fish. Can't wait to read your answers :)
 
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