This Old Spouse
TOTM Winner May 2013
This is one of my tiger barbs who has a sore on his side. It's been there for months and doesn't seem to affect him in any way. Does anyone have any idea why it won't go away or what it is?

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Reading from your sig, maybe one of the crabs got hold of it? Not sure really, you could try treating it in a seperate tank for a few weeks with a drop of Melafix. Maybe up the water changes to see if a more pure water will help it.