Question regarding pouring loose vermiculite into enclosure. I can get a bag of vermiculite that is 4 cubic foot. If my enclosure is 4 feet wide by 4 feet long and 4 feet high, I should only need one bag, is this correct? What are the recomendations for using loose vermiculite in an enclosure? I can not get the ceramic blanket locally and do not wish to pay the high price of shipping. Your guidance is appreciated.