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It's A. cf. bitaeniata (Rio Tigre), the same as my avitar. TomC & I got them in Peru from a collector in Iquitos in 2008. I strongly doubt that yours is the same because it is from a now protected biological reserve. Tom has an excellent report on his trip to the area in 2010 and the bureaucratic problems he needed to get fish from the reserve (https://www.tomc.no/page.aspx?pageid=117). A few years ago a collector recollected some. He had to sneak into the area to collect them and floated his boat out in the dead of night to avoid being arrested. None of these fish came to Europe or North America that I know about. There are other populations in the Rio Tigre, but none as colorful as these. Other locations do have similarly colored populations. Without knowing where yours were collected it is hard to say which of around 20 species/populations that you have.
BTW the photo in my avatar was not color enhanced. It was take in natural daylight in a specimen container (please ignore my fingerprints).