Clownfish nipping at Duncan

[91mini]

I've had a clownfish and a Duncan in the same tank for over a year without an issue. All of a sudden the clownfish has been nipping at the Duncan and causing it to stay closed.

Anyone ever experience this? Why would he be doing this? Can I get him to stop?

 

[sparky45]

I had my female clown nip all the tips off of two feather dusters. I moved both feather dusters and she stopped.

 

[merkywater]

They'll nip at anything that is hosting them. Mine nip at the nems constantly.

 

[tbryan]

Mine nips and hosts my Duncan from time to time Duncan got ****ed at first but has gotten used to it now.