Hi Dave, Definitely try the dry ice! I found a place local to me and was able to get a few small chunks (instead of the 5-10 lbs size they normally sell it in. Worked like a charm in my terrariums (although I did not use it in 2 of them as they do have fauna in them that I did not want to lose). I recently add a few new orchids and now have more tiny snails. I've only found a few so far but if I find more I will go the dry ice route again. How is your terrarium doing these days?