Tanks are ok but i suggest using terrariums with vertical height. I use to have one 29Gallon tank that I housed one of my colonies. It was a 1.5 colony and they were fine. All m other colonies were in exo-terra/zoo med terrariums. Now I have them all in these vertical terrariums. A 1.2 colony will do great in a 12x12x18. Or 1.3-1.5 will do great in a 18x18x24. People say they don't need the height but a Pygmy will climb if given the chance. And I always offer my chams what I can. Plus, it's easier to keep the temps in the right range bc of the vents, easier to clean without towering over your chams and stressing them, and easier to view if you set-up the terrarium correctly.