Black neon tetra

Squirrelbuddies

Fishaholic
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Jan 11, 2005
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Vermont
One of my six black neon tetras has something going on and I'm not sure what it is. I've checked several websites with great photos but cannot find a picture that matches.

At first it looked like he got too close to the filter intake -- several vertical areas on his side that looked like the outer skin was gone. This was a month ago. Now he has one solid looking patch on his side and it's starting to move over his back onto the other side. It's flat and pale colored (whitish/light pinkish -- like what a fish looks like under his skin..) It is not white or fuzzy or raised - does not look like cotton or wool, nor is it bleeding.

He eats well and swims well and is still growing. The water conditions are great (0 Am, 0 Nitrite and 5-10 Nitrate) and I keep the water very clean -- gravel vac once a week and partial water changes twice per week.

The other 5 black neons look fine.

What could this be?

Here's a pic:

f50f1e6a.jpg
 
hard to tell from the picture, but I'm guessing you have
Columnaris.
Treatments include:
Malachite green (except for fry) or Melafix
 

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