all the information i have found say this. costa ricans are yellow. i have a 2" f1 costa rican growing out myself. from what i understand the costa rican males are supost to be blue backed and blue tails the rest is strong yellow. at least that is what i was told and seen from pics.
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Ye that's what iv heard too. So I'm pretty sure mines a nic. I don't know I the body shape had anything to do with it or not.
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