What is my clownfish and watchman goby doing??

My clown and goby do this sort of thing all the time in the video below. They never hurt each other. The clown always opens its mouth on the goby when they get close and she pushes the goby sometimes, but the goby doesn't mind it. It's so weird. One time the goby perched on the clown and they just hung out together for a bit. :silly:



What are they doing???

http://ift.tt/1Fmddpz