Males are supposed to get 20 inches, females 12, so that'd have to be one big tank. I'm not good at tank size guessing, but I'm going to say, 300-400 gallons.
cool will prolly either end up with severum or angels then. still gonna be looking for a tank around christmas time. kinda off topic for the thread but how exactly do you clean sand in fish tanks all i have ever had is gravel