I checked 2 lists of toxic plants and they weren't there under these names you should check yourself as I am unfamiliar with those particular ones. Have you read "the art of keeping snakes" De Vosji ? He talks about a bioactive substrate. I have been wanting to set up a system but have not had the time and am not much of a gardner. But it looks to be the best low maintenance system of them all. An acquaintance of mine has corns set up like this using Carex and pothos and some others in a large enclosure and only picks up poop and stirs in urinates. The only other thing is watering the system every month and trimming the plants.
http://www.peteducation.com/article....+1913&aid=1612
http://www.anapsid.org/resources/plants-ag.html
http://www.anapsid.org/resources/plants-hn.html
http://www.anapsid.org/resources/plants-oz.html
http://www.anapsid.org/resources/plantinj.html