Mako,
Sweet pieces.
1) I believe this is the highly unusual A. meridiana. I haven't seen this species in a long, long time.
2) A. azurea with the rounded and tapered corallites. This is one of the nicest I have seen.
3) A. insignis but this particular specimen doesn't have the contrasting colored corallites that are normally found with this species.
4) From what I can make out from this small piece it seems to be A. tumida.
I hope this helps you out,
Chris @ RM