Does anyone know what's wrong with my 2 damsel fish

[Jay Hemdal Verified Community Expert]

@Jay Hemdal

Sorry, as I said, I need a video in order to assess the fish’s condition (breathing rate and swimming function).

All I can tell you from the photo is that it has mechanical damage, most likely damage from another fish.

 

[tanglover13]

He died unfortunately going to have to set up a separate 40 gallon tank or get rid of my clown