Fin ulcer/rot?

[Andrew1506]

Help, whats wrong with a new ish fish? It's been in a holding tank for a week set up more or less as my main pond with another, but when moved in with it's friend this has happened, the other is fine at the moment so have moved it back out?

 

[Mmathis]

Oh my! That looks painful!

 

[j.w]

@Andrew1506
Sorry I can't help w/diseases and hope someone else will. The fish looks like it's in a lot of trouble. Might want to separate it from the others for now till you get some answers.

 

[IPA]

I’m sorry about your fish. I’ve never had any luck curing sick fish. I’ve euthanized 2 or 3; it’s a tough call but with the ones I tried to save it has only ever resulted in prolonging the suffering.