Shortnose gars generally have very fast growth rates in comparison to the other Lepisosteus gars, so I'd wager that the shortnose gar(s) that you have are some of the larger ones. Solomon and Richard can definitely provide way more input on the matter, though.
Maybe if you're lucky you'll have some hybrids, but at this point that's purely speculation fueled by the presence of those three gar species living together.
