I agree with BPelizabeth they should really have seperate enclosures. Once they reach that size it is not as much as one eating the other but more of a dominace thing. You could try to house them together but you need to watch them carefully and be ready with a seperate enclosure if they dont get along or one dominates the other. Females can sometimes be housed together as long as they are close in size but not always. If they dont get along they could fight or seriously inj one another. The recommended space for 1 adult is usually a 4x2x2 enclosure (minimum 3x2) and rule of thumb is add 2 square ft per additional dragon. If you do try to house them together just keep a close eye on them and be ready to seperate them if anything happens. Good luck and hope this helps.