Gourami: Small white dot turns to moderate pit above gill

[dhlesq]

I am new to fishtanks so I have no experience diagnosing problems.
I have looked at Pandora's disease link and have not positively identified it.

I have a 20 Gal tank with two dwarf gouramis, two tiger barbs, and one cory cat. The tank recently went through a period with high nitrites, which are now under control.

One of the dwarf gouramis initially presented with a pale spot on the right side, above the gill. It was so subtle that I was unsure it was even a disease process.

Now the white spot has enlarged and has turned into a shallow pit. It is as if something took a bite out of its side, though I have no reason to believe that it is from fighting.

One other symptom that I did see mentioned in the disease link: on that same side there is some red coloration in the center of the gill.

Any ideas?

-David

 

[dhlesq]

Sorry for the bump.

Does anyone more experienced have a suggestion?

 

[Lotus]

Is there anything sharp in your tank (rocks, plastic plants, etc.) that it could have bumped itself on? Is the pit growing?

I would recommend some Melafix for a few days, possibly with Pimafix, and then see if there's any improvement or change.