What is my clownfish doing to my corals?

[Pom]

Woke up and my smaller clownfish was doing this to two of my corals. Neither the clownfish nor the corals are new to the tank and I have never seen him do this. Sorry for the dirty glass. Thanks for any help.

https://streamable.com/plc9j

 

[Pom]

The video stopped working so I put it on YouTube:

https://www.youtube.com/watch?v=x3qWmZMgi_A&feature=youtu.be

 

[Fiver]

Looks like they're tying to find a substitute for an anemone. Usually not a problem if the corals are still OK.

 

[Cliving1]

Agreed, they are looking for something to host them. Do you have an anemone for them?