I keep my pair of adult levis and wheeleri in a 12x14 inch tub. 1/2 inch sand cold side and a fair amount on the cool/moist side. Pretty simple. But what age are you looking for?
any as long as they r feeding well and in my price ahah is heat need i have my thick tails just sitting in a warm place and they have been going great just wanted to know about smooth knob tails?