they're not fluviatilis though I can tell you that with certainty. Most likely a run of the mill pet store Melanotaenia splendida inornata, common name the checkerboard rainbowfish. Still they can be quite beautiful and can get up to five inches in length.
Last edited by rainbowfishes; 05-25-2013 at 04:42 AM.
Reason: hit the return button too early :-)