You might want to research neon tetra disease. These are the symptoms and it doesn't only affect neon tetras:
Symptoms:
Restlessness
Fish begins to lose coloration
As cysts develop, body may become lumpy
Fish has difficulty swimming
In advanced cases spine may become curved
Secondary infections such as fin rot and bloating
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The article I read said there is no known cure. I'll get the link and post it below for you.
Symptoms:
Restlessness
Fish begins to lose coloration
As cysts develop, body may become lumpy
Fish has difficulty swimming
In advanced cases spine may become curved
Secondary infections such as fin rot and bloating
--------------------------------------------------------
The article I read said there is no known cure. I'll get the link and post it below for you.