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The Biter versus the Fighter

Gambusia versus Heterandria, kind of like Tyson versus Holyfield!  

Recently I observed Gambusia and Heterandria Formosa occupying the same
shallow, weedy body of water in the Florida panhandle.  Heterandria in the
grass and Gambusia in the open.  I read somewhere that the tiny Heterandria
can be territorial, scrappy, and tough if need be, while the Gambusia's
reputation as a fin nipper is widely known.

Who wins this fight for habitat dominance? And has anyone else seen these two
fish coexist?