add another fish need help

[grandmarm]

hi,
need some help -want to add another fish to 90 gallon reef
so far have one clown that stays in back with the amenone
blue hippo tang
yellow tang
royal gramma (new to tank hides most of the day)
bristle starfish
want to add something that is reef safe and a calm fish. any suggestions?
as always thanks again.

 

[the reef]

I would say a cleaner shrimp or a goby

 

[grandmarm]

forgot to add we have one cleaner shrimp and a couple of pepermint shrimp

 

[teresaq1]

bi-color blennys are pretty cool.