8 foot tank and minimum width of 24 inches better with a 30" inch with. For gallon wise if you can find a 180 with those measurements you are fine but you probably won't so I say a 250gal would be more than enough.
Yea i agree,180 is minimum for me,thats what im getting for mine.but they can be in growout tanks,just dont leave them in the tank for long as they may stunt.
Yeah just get a male atleast a 240 gallon or up for males at fullgrown. And as for females they can be kept in a 180 gallon 6x2x2 and the 240 for males 8x2x2 i think is the dimensions