i tried to keep both green and the blue and eventually the more dominant green ones killed the all the blue reef I think you need to stick with one or the other. donnie had some for sale might look at his sponsor page said:
Frank's tank will order them for you also DNA has them from time to time. We have a blue and green in our 200 gal tank and I must say they become very aggressive to each other and I only have one blue left after several attempts to add them. The blue will kill any green or other blue that I add to the tank but gets along with the green ones that were in there when he was introduced.
I really like them because they together add a lot of color to the tank. By the way they do not bother any of the other fish. I think that if you introduce all at the same time you will have better luck.