Hybrid dwarf angelfish doing the mating dance

[George]

I have a tigerpyge (Centropyge eibli x C. flavissimus) and a blue spot (C. flavissimus x C. vrolki) being together for over 2 months now. Just a few days ago I noticed them doing the mating dance. It's a huge surprise to me. I thought these hybrids are sterilized.
Enjoy the show. The first few seconds are some still pictures of the parties involved.

http://youtu.be/N6kccmDl8J4

BTW when will canreef support embedded video?