The first is very likely A. millepora. Polyp extension would not really mater on the ID. I would mount it on its side so all the corallite tips are pointed up and give it some good water flow.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0047
The second is not A. batunai. The tapered axial corallites and thin branches would lead me to A. caroliniana.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0015
For the third I would say A. verweyi if it grows into a table with even upright branches.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0079
Or if those branch continue to grow outward like a staghorn type then I would guess A. hemprichii.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0672
I am not 100% but pretty confident that last is A. divaricata.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0024
Those last two I would break up the branches and give them strong water flow. Replicating the water flow needed for those can be very difficult as colonies.