Hi I was trying to get some advice on making a bioactive setup for my Russian tortoise. I've done a little research but I figured there might be some experts here that could provide good advice. So really I would like to know what kind of subrate would be recommended for a bioactive setup and would I need to add anything to the substrate? I was also wondering if it would be good or bad to grow grass with edible plants in the bioactive setup? Then should I use pill bugs or earthworms? And lastly if I do this would I ever have to replace the substrate or would it just always be fine from the insects cleaning and me spot checking?