So I bought these 2 only on the whim that they might pair up and I can attempt to breed them and raise captive raised Banggai cardinals. According to a very reputable source, this is what they do after they pair up. the stuff below including the youtube vid is not mine. I will add my own video hopefully soon. " Courtship: Courtship is rather obvious. For those who can watch a Youtube Video, this is probably all you'll need (the larger fish with the bigger head is the male) For the rest of you - courtship starts in the afternoon and is initiated by the female. She swims up along side the male, parallel, and begins to quiver rapidly. She will then drop behind and do the same along the other side of the male. This back and forth vibrating dance may occur on the day of, or the days proceding spawning - seeing the courtship dance does not mean the fish will mate on that day, only that the fish are getting ready. You will also see the female continue to stimulate the male through this courtship dance in the hours immediately after spawning. " Here is the full link to that breeding forum. Marine Ornamental Fish & Invert Breeders Association • View topic - Banggai Cardinalfish Breeding/Spawning Overview - Pterapogon Now I will attempt to raise them once they actually mate and the young are transferred to the male's mouth. I was simply watching my fish today and saw the dance, even before I looked up exactly what their courtship was. I will see if I can get a video.