Stocking 55 gallon tank

I have a 55 gal. set up about 3 months ago. So far it is live rock/fish only but I plan to add coral in the future. I'm looking to add some more fish but need suggestions or input on compatibility. Some fish I have been looking at are the bangaii cardinal, a pair of firefish, small school(5) of green chromis, and an angle or a tang.

This is what I have so far:
2 orange clowns
1 6 stripped wrasse
1 Dragon Sand sifter goby
1 coral banded shrip
5 or 6 blue hermits
3 margarita snails