What the heck are my Chromis doing?

[Rob's Reef]

So I just noticed this last night. Looks like they are possibly doing a mating dance? Idk...

https://www.dropbox.com/s/zyaaad3prnn5f49/20160607_174525.mp4?dl=0

 

[killingseed2000]

looks like it to me. nice video

 

[eatbreakfast]

Yup, they're spawning.

 

[Rob's Reef]

Sweet! Too bad I won't actually get mini chromis. still neat to watch