Optimal tank is 120 gallon I did the measurements and its a 50 gallon --- this would be good for a baby up to a year or so then I would look at getting a 120 gallon unless you get the dragon out a lot then you could keep them in it -- they do like floor space tho -- I posted on the tank threadHello can anyone help me i have bought a beardy vivarium it is 3ft/1.6/1.6 is this big enough?