Beanz' 15 gallon nano reef tank

[Beanz]

hmmm, there are threeroutes that i am leaning towards, those would b having a goby/shrimp pair but idk if the pistol and cleaner would get along especially because of the small tank size, 2 snowflake clowns, or a clown goby and a rainfords goby. Whats your feel on these ideas? I still have a while to wait before i'm gonna be adding anymore fish.