percula and flame angel

This is my first post. I have a 55 gal tank and need ideas and help. I have: 1 - percula clown 1 - scooter blenny 1 - purple fire fish I had: 1 - flame angel (dead- i think clown killed it) 1 - orange spotted blenny (dead- starvation? wouldn't eat.) I want to add more fish but not sure what...