That might be fine for a female or a small male. 30" is going to be too short for a standard male. If you put a potted plant int it, hes gonna have what, 18"-20" of play room tops(if the tree touches the top of the cage), yet hes going to be well over a foot long?
Henry, I checked on their website(shoulda done that first) and you are correct! That is what they are selling NOW. Three years ago they sold the 36 X30 X18. I would recommend going with something bigger than what they are selling. Not saying it will not work of course, but it does not give them much room to roam.