Maroon clownfish tail injury

[MrZ3no]

Today I noticed that my maroon clownfish tail is like this. I don’t know what happened. He seems health and active and eating just fine. Only other tank mate he has is a green spotted pufferfish. All the parameter are in check. It’s in a 20 gallon long, with a hang on the back filter. Should I be worried?

 

[MrZ3no]

 

[i cant think]

Looks to me like he’s been nipped. Potentially by the puffer.