Want New Additions

I want to add some new fish. My tank is doing good i have around 55lbs live rock, 40 gallon tank two clowns,clown goby shrimp hermits and snails. I really want a tang my LFS has a baby yellow and a baby hippo but i dont want to push it cause i know they are gonna get bigger. So if not tangs than what???
 
I hear ya on the tang i dont want them to be unhappy. So i plan on doin a total reef on this tank so any ideas besides what i have that are small and reef safe??
 
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