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Septicemia for sure! You got a really good chance with this fish if you can feed it antibiotics. MOST aquarium infections are gram-negative and can be treated with antibiotics IN THE FOOD ONLY. If a sick fish will eat, you got a really good chance. I use Maracyn Two - this is a gram negative broad-spectrum antibiotic and have cured a fish that looks just like this one from the septicemia by feeding her maracyn two mixed with some repashy. Indeed- when I make such food, I mix in some metronidazole and praziquantel (API general cure) as well. I always feed this to my fish. Dogmatic statements to follow:
Fish Don't Drink.
Adding medications to the water column can only harm the tank.
Antibiotic molecules are too large to pass into the fish through the gills.
Antibiotics in the water WILL kill your filter.
A dead filter will make your fish health worse.
 

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Those are all super good points of clarification.

Metronidazole CAN be safely added to your tank, and this will likely only harm your pocket book. I did learn something today though... My original response was going to be "Of course you can do that, Metro is not an antibiotic." But... it absolutely IS an antibiotic. It really bothered me then, why one was OK and the other not (Yes, even in my personal experience. I HAVE treated whole tanks with general cure) Since I had to learn today, y'all gonna learn today...

Erythromycin is a gram positive-antibiotic in the drug class macrolide antibiotics. This family was what I had in mind when I mentioned "Antibiotics" which should never be added to the tank. This family will hurt the biological filter (unless you take steps like DJR did when treating cyanobacteria... the harm must be planned for, but that's beyond the scope of this particular pontification).

Here is the reason Metronidazole can be added directly to the water and won't harm your filter. Metronidazole, on the other hand, is in a family called Nitroimidazoles. This drug class is used to treat ANAEROBIC microorganisms. Your biological filtration is decidedly NOT anaerobic, so it doesn't hurt your filter. This fact is actually why it's so effective at treating bloat (when the patient will eat it). The critters that cause bloat (most of the time) are anaerobic in nature and have grown to an extent in the fish's intestines such that intestinal wall responds by becoming inflamed and the whole intestine blocked. Metronidazole in the fish will kill the offending anaerobic organisms. Must get it in the fish though...
 
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