Help with sick fish

[bable]

Can anyone help me diagnose what this is and how to treat?

 

It's progressed pretty rapidly since Thursday. In quarantine now.  I got him from liveaquaria 2 weeks ago.

Thanks in advance,

 

...I'm hoping this is the right forum.

Edited September 15, 2019 by bable

[YHSublime]

It looks like it’s scratched, intentionally, on a rock. There’s folks that know a ton more than me though that will hopefully join in.


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[Jon Lazar]

I don't know what it is, but I know what it isn't.  It's not velvet, brook, ich, or flukes, unless there are other symptoms too.  Does the fish spend a lot of time swimming directly into areas of high flow?  Does the fish avoid being in the lights, but comes out if the lights go out?  These are both behavioral symptoms of gill parasites.  Are you doing some sort of prophylactic treatment while in QT, like copper?

 

If you answered no to all of the above, it might be a bacterial infection or a fungal infection.  Bacterial infections are reportedly much more common that fungal infections.  Therefore, I would treat with antibiotics. 

 

Treatment consists of kanaplex, metroplex, and furan-2 at the same time.  This gives wide-spectrum treatment for gram positive and gram negative bacteria, and they're safe to use together.