Like I said in the other classic terrarium post, I have several classic terrariums. I love them all, but the one problem I have with them is not knowing how often I should water them. I usually check the soil with my fingers and see how damp it is, but I don't know if this is a good way of doing things. I don't want to overwater, because that would encourage root rot. Anyone have any tips or past experiences with watering classic terrariums?