Looking for a diagnosis!

[daniella3d]

If it's brook paraguard should take care of it in about 3 to 5 day you should see improvement. I hope the fish is not too far gone.

It's been a long time though..and brook is a fast killer, as well as marine velvet so I doubt it is that but you never know.

I would do a one hour dip at first at dip concentration (written on the bottle) and watch the fish. if it is a parasite, that dip should improve the fish condition to begin with.

Looking at the pic of the fish..this is urgent now. He's in bad condition.