02-09-2009, 01:16 AM
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You didn't mention the size but judging by the plant leaves they're fairly small so I'm guessing that they're Silvertip Tetras (Hasemania nana). The males, particularly when well cared for, will exhibit the orange and yellow coloration evident in your photograph. These are generally quite peaceful and hardy fish and max out at around 2 inches long. They are also one of the few tetras that don't have an adipose fin (a little tiny fin along the back, behind the dorsal and before the tail) which may have led to your thoughts that they were rasboras.
Last edited by jetthd; 02-09-2009 at 01:23 AM..