It has been brought up before, but it caused such a stir that I believe the mod's put it quarantine. But bsash is right, breeders have used plastic for a long time and have never had a problem. A lot of people on here use plastic and swear by it.

When I worked for a company that makes plastic containers, we had this question come up a lot. The studies done in the lab showed that the plastic had to be heated to over 1000 degrees. Now, how much of that is true, I don't know, but I wouldn't worry about keeping your little buddies in plastic.