Just guessing, but 1) looks like A. valida. Are the radials appressed tubular or are they scale-like? Great-looking coral!
2) a bit small, yet, but could be A. cerealis or even A. gomezi, depending on how it developes.
3) A. exquisita, a fitting name, it's beautiful!
4) tough, but may be A. formosa, A. grandis or A. pulchra. Are the radials tubular or scale-like?