What is my clownfish doing to my corals?

Pom

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