How often did you have to replace it? And how did you keep the moss alive? I figure I'll just use a moisture-holding substrate to keep humidity up, but offer a humid hide regardless. It'd be really neat to have the living moss substrate and have it be sustaining, i.e. not have to replace it. Seems like a waste of a plant. I tried to keep moss in a terrarium and repeatedly killed it, so it doesn't seem possible for me.