Krista, are they all from the same brood? And have they "sexed" themselves yet? And is there an anemone in the tank?
I attempted to introduce a second pair (already sexed) into my five foot 90 gallon (which had an anemone), and it was World War III right from the get-go. I had to remove half my rock to get the one pair out. Both pairs wanted the anemone.