A word of caution, if the fish was a mature male already, it's possible for it to be well on it's way to become a female. If you really want that spawning female, I'd say the absolute safest is to buy that female, find a second very small fish (juvi from an LFS or local breeder) and pair those two up. Otherwise, be careful shen introducing them and have an exit plan readily available in case of excessive fighting.