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I have seen them before never figured out the name though. My uncle had the when I was 5 and I remembered them ever since. Still never figured out their name after 10 years.
Interesting. From what I can see it looks like it has a blue base body with very fine red lines running through it. Also the red fins. It makes me think of the species Melanotaenia rubrivittata even though it's a new species. Was it a dwarf or full size rainbowfish?