Some other benefits to not cohabitating: 1)Knowing exactly how much of what each beardie ate. For example, when I separated my two adult females (after they started fighting) I learned that Lotus will eat anything green and hates red things - but Monster loves all things red & usually only eats the non-staple greens like bok choy and arugula lol. 2)Always knowing whose poop is whose in order to check for health & frequency, not to mention collecting for fecal testing . 3)Both of them won't get sick just because one of them is sick. Both my beardies came to me w/parasites which are VERY common, so I'm glad I don't have to worry about them passing it back between each other. 4)Yes, they can fight. When you least expect it. No matter what. My two girls had been housed together since they were babies & still ended up fighting. Sound reasoning?