What smaller fish can I add to my 180
 

Hi Guys, my 180 reef is doing really well {not bad for a newbie} here is my qustion I want to know if it is safe to add some smaller fish and if so what?
Heres what i have now.
Medium to large: Naso Tang, Hippo Tang,Blue Throat trigger.
Medium: Yellow Tang, Kole Tang.
1 Christmas Wrasse,
2 ocellaris
1 large blue chromis
2 small green chromis
1 sea cucumber
2 cleaner shrimp.
Multiple corals and three anenomes, Derasa clam and a flame scallop.
Before I put the trigger in the tank my Christmas wrasse would not tolerate any other wrasses so I guess i cant put any more in there unfortunately cause I love em. He killed my canary wrasse and harrased another so I had to remove it.
I am concerned about any new fish going in with the trigger?
I would like some character fish like blennies /Gobies etc, I had one large gold blennie but i think the wrasse killed it .
So this is my dilema, Any ideas please.

Thanks