Black line under neon tetra?

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Psylk87

Aquarium Advice Activist
Joined
Jan 14, 2013
Messages
183
I have had my neons for about a year. They alll seem helathy and look good. However of the past few weeks I have started to notice a black lin develop under the red fo the biggest one. It is at the bottom of the tail under the red. I dont see it on any others yet just the one.

What does ti mean?

I couldnt get a pic but I found on online it looks a lot like this but maybe just a tad darker and possibly a smidge thicker:
2626.jpg
 
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