What species of fish is this!?

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Ah this is Aus! Definitely a rainbow I think :)

(Silly me tried looking at American natives)
 
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They look like Melotaenia fluvialatillis (the Murry River Rainbow) or one of their sister species.
Hmm just looked it up, and I don't think they are a species of rainbow, they don't have the right body shape to me. And also they don't always have that blue shine, it only shines blue in certain light.
 
I keep M. Fluvialatlis, and they don't look like this, this fish's belly is too thick, mine don't have that bulge in the back, and it's caudal fin is rounded while mine have pointed tips, also mine aren't so blue, but I know better than to argue with duanes duanes
Every rainbow I've ever had only showed color when it was happy and the light hit it the right way. I don't think they have color, they're just iridescent. If it has 2 large dorsal fins it is either a rainbow or a danio, minnows only have one, and characins have that tiny adipose fin. I think it's a rainbow, even though I only see one dorsal fin.
 
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