i know that if and when you get a pair that the male sometimes will kill the female if there isn't enough space in the tank for her to get away(so plan on at least a 200gal) and if not get a tank devider to split them up if need be. GOOD LUCK
Get something smaller than a 200 although a 200 is right size. I recamend a 55 or 75 gallon and also change the water alot if you want them to grow bigger and faster.