Ptrick125
Learning a lot everyday

This picture was taken in my SW tank, but I'll give you a hint; it's a live bearer...
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Matt, Nothobranchius korthausae and Patrick if you can get a better picture it would be easier to ID for you but assuming you bought the fish in a mom/pop shop as a feeder or to cycle your SW tank im just going to say a common Gambusia affinis or Priapella intermedia.