I'm not sure, we got him from a friend who was closing down his tank, and he has looked that way for as long as I have had him. I have always wondered if this pair is the result of a cross between an orange percula and a black percula. I am sure he is healthy though, I think they just laid eggs again.
Also, anyone know exactly what green coral is that in the very center? I was told this is called a money tree, but I can't find any info. It was just a fragment that an aquarium store gave us, so I never found out what it was.