Most of the commonly available Chrysiptera species are pretty tame compared to other damsels (barring Fiji Blue Devils, of course). That said, mixing them is like mixing cats. Some get along with other fish and each other. Some don't. There's also a few other considerations:
• Are they the dominant fish in the aquarium?
• When were they added in relation to the other fish?
• What is the total stocking density of the aquarium?
• How often do you feed the tank?
• Have they previously killed off other fish?
These are all variables that are going to greatly influence the behaviour of any given fish. If you want the best chance at it, here's what you do (IME):
1. Make sure they will never be the most dominant fish. This should be easy if you have a tang or a big anthias male.
2. Add them last or, at the very earliest, after the biggest, most intimidating fish has become comfortable in your aquarium. This doesn't necessarily have to be an aggressive fish (Naso Tangs come to mind).
3. Keep the stocking density medium - high for normal compositions, low if you have only bigger, more intimidating fish outside of the damsel.
4. Don't 'inherit' problematic fish from other people.
HTH
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