I am leaning toward a Rokteil Severum because of the red on the bottom fin. My Green Severum never displayed the red color when he was that size. Still it is difficult to say for sure at that size....still a great looking fish. Congrats!
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Looks like my baby rotkeil I had a few years ago, but then again baby rotkeils look exactly like baby greens. all you can really do is just wait until some of the red comes in around the shoulders. My rotkeil already had red around the shoudler starting to form at that size but it might be because he was f1.
Its a Rotkeil or a Notatus cos its only got 8 bars, i have both and they almost look identical at 2" except the notatus shows spots when his bars fade.