Thinking about getting the Exo Terra 36 x 18 x 36 for the 3 WTF, but my concern is being able to keep the humidity & temps up for them. Looking to see if others have this size, or would it be better to get the 36 x 18 x 24 instead. They are now in the 18 x 18 x 24 but seem to be outgrowing this, at least to me it seems that way.