I have a question in regards to obligate burrowers. Does it effect the over all health & longevity of an obligate burrower if the substrate isn't deep enough for the specimen to burrow? I've seen C. crawshayi & H. lividum kept in enclosure that did not allow them to burrow. I personally don't agree with this, but that's just my opinion & preference. Have any of you long term keepers made an observation/analysis on the effects of not allowing an obligate burrower to burrow?