I introduced a trio of young Bangaii Cardinals to my tank about 4 months ago. Two weeks ago a pair formed out of the three. The third cardinal stayed away from the two and other than some very brief chasing there was no other aggression. I've been trying to catch the third cardinal since. I wanted to move it to my refugium until I could find it a suitable home. Two days ago the pair diligently kept the third cardinal on the other side of the tank. A lot more chasing than before. I saw the next morning the pair had spawned. The female has now left the male carrying the eggs and is acting as a pair with the other cardinal, who i now presume is also a male. What do I do?