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Discussion Starter · #1 · (Edited)
So I recently picked up a few rainbowfish from a member on this forum. He mentioned that 2 of his larger rainbows had been picked on by another fish and suggested they had some damage and seemed stressed.

I thought nothing of it at the time and took the fish from him. One of the australian rainbows had what appeared to be a little damage on his upperlip. I thought it was nothing more than damage from being picked on by a bigger fish.

However, now that its been in my tank for a few days I'm not so sure it is physical damage and am concerned it is a fungal or bacterial infection.

Could this be columnaris/cottonmouth or am I overreacting? I'll try to get a few more shots if anyone thinks it might help.


 

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I would go ahead and treat for it just to be safe, but after 3 years of working with fish I've noticed rainbows like to bash their faces on the bag during transit. We get rainbows in all the time with wounds on their mouths and they almost always recover.
 

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Discussion Starter · #3 ·
I would go ahead and treat for it just to be safe, but after 3 years of working with fish I've noticed rainbows like to bash their faces on the bag during transit. We get rainbows in all the time with wounds on their mouths and they almost always recover.

Well thats a little re-assuring at least. Any advice on how to treat it without killing plants or shrimp or beneficial bacteria?
 
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