[nemo all the way]

i dont think it is a good idea to get more than one pair. this is because they are all males when they are born, once they start to mature the largest out of all of them becomes the female. then from there on its all about competing for the female. the female will choose who she wants to mate with and the males will continue to fight because the male she chose will protect her and this could lead to him killing th other males. so it probably is a good idea to only get one pair and eventually if they want to breed then those two will be the ones. this doesn't happen over night it could take months or even years for them to breed. they have to feel that your tank is a mirror image of the ocean so they feel safe when they lay eggs. also they probably wont lay eggs unless they have an anemone.