Justin, your clowns have already paired up then.
Make sure when you add a new clown that isn't too much smaller because sometimes it backfires and the larger one that has already established itself in the aquarium might kill the newcomer. I've seen it happen both ways, when they pair up or they get killed. Most of the time also the fish that is introduced is sexless while the fish already in your home aquarium if they are there for a month are more, is likely to be a female.
3 Gallon Betta, 14 Gallon BioCube Planted, 29 Gallon Community, 29 Gallon Parrot Cichlid/Pleco
46 Bowfront Reef Tank, 3 Cats, 1 Choc. Lab