Clownfish Diagnosis - Red inflamed spot on fin

[Jess89264]

Rescued this little guy from LFS, he was beat up badly and owner did not seem concerned ('JUST GLAD TO HAVE FISH DURING THE PANDEMIC!" - quote) ! - Slight overbite to assuming from inbreeding.
I have him in my QT / Hospital Tank on Myxazin for his fins. I noticed this red spot on him - any ideas? His fins are less clamped than originally and he is eating well.
Tank Details: QT Tank 19G - Bare bottom, Sumped. Ammonia - 0, Nitrite - 0, Nitrate - 0.2, pH - 8.2, KH - 10, Ca Mg etc all stable too.

Any thoughts would be appreciated, I have erythromycin should it take a bad turn but I would like to leave this to last option.

 

[Big G]

Good on you for the rescue of a fish in distress. Nice job
The Myxazin should do the work on the bacterial infection. Boosting it's immune system is important too. Consider adding Beta Glucan to the food mix. It can help a lot. Link below on BG info.
Erythromycin works really well on eye infections of the gram positive type. Most saltwater fish infections are gram negative.
The only way to know for sure would what type you are exactly dealing with would be to do a scrape, and then a gram stain test.

Beta-glucan as an Immune Stimulant in Marine Aquaria

By Christine Williams Inevitably as reefkeepers we do things that stress our fish and invertebrates: bringing new animals in, moving them from tank to tank,

reefs.com

 

[Jess89264]

Thanks for the reply. I will order some Beta Glucan. I did consider doing a scrape and staining under the microscope but I don't want to add any undue stress on the poor thing. Hopeful as he is spritely and eager for (small size) food he should make it! Interesting about Erythromycin and gram-negative bacteria, I have previously used it for freshwater fish with success, but getting his immune system boosted is the best treatment anyway.
Thanks again!

 

[Big G]

Thanks for the reply. I will order some Beta Glucan. I did consider doing a scrape and staining under the microscope but I don't want to add any undue stress on the poor thing. Hopeful as he is spritely and eager for (small size) food he should make it! Interesting about Erythromycin and gram-negative bacteria, I have previously used it for freshwater fish with success, but getting his immune system boosted is the best treatment anyway.
Thanks again!

Yes, you are right on about using Erythromycin on freshwater fish. Many of the infections in FW are gram positive.