OK, doing some more research, I think that...
#1 - Acropora Tortuosa - some blue variety
#2 - Acropora Millepora
#3 - Stylophora Pistillata - Green Stylophora
#4 - Acropora Tortuosa - some purple variety
Agree? Other thoughts?
John
Heres my guess of IDs...
#1 = I have no clue
#2 = Millepora
#3 = That green ORA birdsnest. Stylos have knobbier branches.
#4 = A. valida (aka tricolor)