Recommend me a fish for this 90 gallon reef tank?

[DannoOMG]

It has been a while since I have posted here. Closed down my 25 gallon nano at home but I still goof around with the 90 gallon tank at my work. I wanted to know if I could add a fish(or more) to this tank but I don't want to make a mistake. Everyone in the tank has been getting along with just a couple "get out of my space" moments.

This tank has been running since 2018(?). It is a mixed reef. When my boss first set it up he did the old fashioned "stack the rocks in the back" kind of aquascape.
List of fish in the tank:

2 - Clownfish (Ocellaris and some black and white one that are friends)
1 - Lemon Damsel
1 - Azure Damsel
1 - Orchid Dottyback
1 - Spotted Mandarin
1 - Lyretail Molly
1 - Pajama Cardinal

Inverts (if it matters):
1 - Tuxedo Urchin
2 - Turbo Snails
1 - Linckia Sea Star
1 - Tiger Cowrie
(a few random blue legged hermit crabs)

I just wanted to ask so the next time I am at the store getting fish food I can be on the look out for whatever you guys recommend me. Also I accept if the tank should be left alone and not to disturb the dynamic. Thanks for the advice.

 

[shakacuz]

keeping in mind that the damsels may or may not bully any new fish you add, but i would consider a yellow tail damsel as you already have two(lemon and blue). a blenny could be an option but would hide/perch on rocks or in caves