That makes more sense sorry. I would suggest that 2 feet tall is harder to heat and hold humidity. Personally the 18 inch enclosure I had I ended up cutting down it is just easier all the way around. Royals don't need the height so it is wasted on them. I would suggest min 12 and max 18. ZIt is just easier like this. I think the vision guys have it right at 16 tall enough but not to tall to manage.