You should not house them together. Look at animal plastics or look into building your own 41qt rack. for only 2 it will be very inexpensive to build. I built both of mine and each are 8 tubs and cost me about 125 each. Reptile Basics also have inexpensive 3 tier racks. I had tanks and once I got the racks they started doing better. Sheds, eating, over better. But that's my opinion, others may have different opinions.