Injury or illness?

[JayM]

Noticed dorsal fin damage on my YWG last night. No other issues with appearance, and behavior is completely normal. No known aggressive tank mates. He is paired with a Tiger Pistol Shrimp, so maybe the YWG got in the way of a snap? Quick retreat into his hole and damaged the fin?

Should i attempt any sort of treatment or just keep an eye on him?

 

[MnFish1]

I would keep an eye on him, and watch for extension/infection (redness, etc) - This looks more like injury/bullying from 'something'

 

[Jay Hemdal]

I agree with @MnFish1 - unless there are other symptoms, (redness, growing fin damage, not eating, etc.) I would just watch it for now.

Jay