I kept one years ago in a 100 gallon with a chiller. They like cold moving water in the upper 50's to low 60's. Hence the use of the chiller. Kind of boring to me so I released it back into the lake it came out of after keeping it a year it also outgrew the 100 gallon.
What the heck is wrong with people? NEVER EVER EVER release a fish back into the wild! People like you are the reason there are so many laws against keeping natives!