Some species of lizards can share tanks, others cannot. Generally, it is not a good idea to place a small reptile in the same terrarium with a larger one. If you do not want to purchase more than one reptile cage at a time, I would recommend investing in a large reptile cage or large reptile enclosure that can be partitioned. For example, Cages By Design sells numerous reptile cages and glass terrariums in various sizes. You can also purchase cage dividers that allow you to separate your lizards so they don’t accidently harm each other. Check out their website at www.cagesbydesign.com