My tortoises are getting a larger enclosure soon, and I was wondering about substrate. Right now they have bio-active substrate that is a mix of soil, orchid bark and coir. I used it because I wanted to grow plants. Well, in the new enclosure I won't be growing plants so should I stick with the Bioactive, or just use coir and bark? Can I still add pill bugs if I don't have soil? Will the torts stay cleaner with just the coir?