My limited experiences with wrasses tell me that a 60g cube is rather small for 4+ wrasses since it doesn't have the tank length. I think it can be done but don't be surprised to see future aggression once they grow up to adult sizes.
My melanurus chased a newly added temminicki for about a week, and now they generally mind their own business, save for a bit of frontin' couple times a day. Keep in mind that my tank is 8' so there is quite a bit of room for them, and they still display this aggression (there are about 10 other non-wrasse fish in there).
Good luck with your new purchases, wrasses are beautiful fishes, I myself plan to add more in the future.
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