I had posted on this thread earlier but my post is not here. I don't know if this is due to an error by me or the system but I will post again. I have some snakes that are kept in a rack and I have some in PVC cages. Care is much easier in the rack. However, I find that the snakes kept in the rack are all startled to some degree when I slide the tubs out, some more than others. The ones that are in PVC cages with glass or acrylic doors peek out of their hides when I walk into the room and are always at ease. That has been my experience. I would not use a glass tank for the following reasons- The snake would be more exposed and perhaps feel stressed- It would be harder to control heat and humidity- You can't stack them. I would recommend a rack over glass terrariums any day. If you can afford PVC cages and don't have a large number of snakes I would recommend them. The smartest and most cost effective way to go would be a rack. If you buy a new snake you just put it in an empty tub instead of getting a new enclosure (not to suggest that you don't need a quarantine setup of some kind). If a glass tank is your only option because of cost (you can get them free or very cheap) that will also work. I feel either of the other choices would be a better one if you can swing it.