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They might be the same species, the fish markings look similar, just not the colour. I know that some wild caught silver coloured Tetra sp. develop <"gold colouring in the wild">.The even more confusing part is they swim together as if they are the same species.
cheers Darrel.........The standard colour of the fish is a rather dull silvery grey, with a little colour in the fins. However in certain areas in nature, the species is sensitive to a particular type of trematode parasite. This causes a reaction in the skin of the fish, resulting in a spectacular metallic gold colouration formed by deposits of guanin. When initially discovered, these golden fish were mistakenly described as a new species, Hemigrammus armstrongi. This is now considered a junior synonym of H. rodwayi.......
They might be the same species