another thing is at 2"-3", while i believe it's possible to tell a Lepisosteus from Atractosteus, it's almost impossible to tell the different Lepisosteus apart. so while you might be after a shortnose, and the gar is sold as a shortnose, theres no guarantee unless the guy selling it really really knows the stuff, or theres info on when and where the fish is collected etc. for one to make an educated guess. but good thing is like anne said in home aquaria they are often smaller, but a wide tank is needed eventually.