Well, my son went out and bought a 30 gallong for his 6 mos. old beardie and spent $100.00 bucks at Petco... WOW!, how ridiculous was that? I do have a question though, I have a 1 year old female and she is 17" long in a 30 gallon tank. She is EXTREMELY lazy and does not move, she is literally in the same spot she is when I get home. Do you think a bigger tank would be a waste of my money for her to be in?