right now i have one snaapping turtle and three painted turtles. i wiuld suggest getting paainted turtles because the snapping turtles will eventually get too big, even for a 120 gallon. common snappers can get to be at least three feet across the shell and allagator snappers can get to be almost five-six feet acoss the shell. allagator snappin turtles are the largest freshwater turtle in the world. i have never heard about a turtles growth being stunted because their tank is too small. a 120 will be big enough for at least four painted turtles if you have sufficent basking areas. no matter what you feed them they will eat fish. they just can't resist chasing them down and trying to catch them. alot of the times i will find dead feeders in my turtle pond in my backyard. they were cought and klled by the turtles but they didn't eat them. if you feed them enough they won't kill as many fish like you said. i don't know if thy are native to your area or not but rosy red minnows, the brown or wild form, make good fish in a native tank. they are small, cheap, often 12 for a dollar at lfs, fun to watch, and easy to breed. you can also get them at a local bait shop. and what ever you do don't put crawfish in the tank. they will pinch your turtles and not let go. if you do want them in your tank, just take off their pinchers. they tear off easily and grow back so check it often. that if all i can think of for now, good luck.
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