It's very common for pet stores to house multiple beardies in the same tank together regardless of size difference or aggression. I won't lie and did they same thing myself when me and my now ex-roommate both got beardies. Kept em both in the same tank while I was building mine his own tank and well one day Curly thought that my Eds' hand look yummy and bit the thing nearly off (went thru the bone). Well long story short they ended up having to be housed in different tanks, I had to sadly amputate Ed's hand and then Ed finally had his custom tank finished so he could live in it. Here's a pic of Ed and Curly when they lived together and another couple of Ed in his forever home untill he sadly passed away earlier this year. I will say that that even having only 1 hand he was still a great climber/ runner.
