Adding another fish?

[Slyler]

I have a 120 gallon aquarium with a stock list of blue hippo tang, tomini tang, copper band butterfly, one spot fox face, flame angel, coral beauty angel and a few ruby red dragonets. I am wondering if adding a small gem tang would be too much? Or ok as a final fish?

 

[Cheese Griller]

should be okay since it's a different genus than your existing tangs!

 

[Fish Styx]

I have a 120 gallon aquarium with a stock list of blue hippo tang, tomini tang, copper band butterfly, one spot fox face, flame angel, coral beauty angel and a few ruby red dragonets. I am wondering if adding a small gem tang would be too much? Or ok as a final fish?

You'll be good to go here. The Hippo should be rather ambivalent (IMMV). I would expect the most aggression from the Tomini here, but should subsid rather quickly.

Wrap your tank to block out any light entering through the glass and kill the lights. Feed as usual and keep the ta k blacked out for 72 hrs. Tha k @vetteguy53081 when you unwrap it. This is his method and it works like a charm.

Keep a small mirror on hand, just in case so that you can distract the aggressor(s) as necessary. Let them attack their own reflections like this:

 

[Slyler]

Awesome! Thanks for the info!