Yeah this can happen with most any sort of fish that forms a pair thru bonding. Granted this can be used to your advantage as well if you decide that ya want to pair em up with other fish.
Hopefully yours gets the whole parenting thing down right. It generally takes a few tries or more before ya can tell if they're going to be good parents or not. Generally I look for small improvements in how they do things every spawn because generally if they continue to improve they will become good parents but if they show no improvement they probably just weren't ment to be together so to speak lol.