Seen the pics but I know its hard to get pics of fish when you need to, but the most damaged side of the fish would be better.
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/www.fishvet.com/columnaris.htm[/URL]One last link sorry.
<a href="http/www.fishvet.com/columnaris.htm" target="_blank">http
/www.fishvet.com/columnaris.htm</a>
Taken from the link.
Skin. There will be necrotic lesions on the skin, which often are white/gray colored with an edging of red. These will quickly transform (in a day or two) into ulcers with have an orange/yellow color, caused by the bacteria decaying the underlying tissue.
The pics are bad.
Your not going to save the fish on over the counter meds, you need a vet and to be honest I think its to late.
Issolate the fish.
Is there any other fish showing signs of the same thing.
When fish have open wounds the bacteria enters the fish causing alot of damage, resulting in septicemia.
I would still medicate the main tank with a bacerial med.
Septicemia can leak from a fish and enter the tank water infecting other fish.
As for the fish with the ulceration not looking good, you could issolate and try a bacterial med.
Imo deff Columnaris. Romet B is the only thing that will kill the parasites. I would treat the whole tank in this case with bacterial med. This must have happened over a number of days, shame is, if treated early, it could be cured quickly. Gotta be honest mate, doesn't look good for the fish. Take it to a vet. We have some stronger meds that will give an intense treatment, but the meds you by in LFS are generally a course of treatment over days. Romet B is my recommendation in isolation, and yes, bacterial med the whole tank.
Emma