The question I am wondering about is.... How long does it take for them to reach about 5 inches? I know a guy that has 2 that are around 7-9 inches and he has had them around 7 years, he keeps them in the 265 gal display in his fish store in Pa. So if it would take 2-4 years to reach that size then that would give ample time to plan for a larger tank. Just a thought. I agree with the Khuli's, I think that would be a better choice and they would do great with sand and plants.

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55 Gallon Planted dirt bottom,Reproducing colony of Heterandria Formosa(Least Killifish), 2 Dwarf Puffers, 5 or so Gambusia, 2 Swamp darters???, Several Wild P. Latipinna(Sailfin Mollies), a handful of Jordanella Floridae(American Flagfish), 1 Lepomis Macrochirus(Bluegill fry)