The only damsels I will keep are green chromis. Most others are or become mean, IMO
My GSM was so cool for the first 6 months, and yesterday I came home and he was beating on everyone. Even with my hand and net in the tank he wouldn't stop fighting.
I was warned about this with maroons. I've heard it gets worse
as they mature.
Fish, like people have different personalities, so you might get lucky,but I'd ditch the damsel.
Both of those fish could pick on any new addition