Hi, I don't post much, I mostly read, and this is my first thread, but not my first post. I told the manager at a Petco today that I had switched from a 40 glass critter cage to a plastic sterilite tub. (I just hooked it up today. I have a thermostat set on 90, the probe is taped between the bottom of the tub and the ultratherm heat mat, the heat mat is gray duck taped to the tub. The inside bottom of the tub ( where the snake is) is about 87 degrees, measured by heat gun.) The snake just ate 2 mice. She is staying on the warm spot for now the ambient is 80. Everything seems fine. But I am worried because the lady from Petco said "I should have stayed with glass, or at least to be careful, because heat mats are made for glass and not plastic, when heated, plastic will let off toxic fumes". So my question is, will the plastic give off fumes that will harm my snake even though it is only warmed to 90 degrees because my heat pad which is the best(ultratherm) is connected to a thermostat which is set to 90. At what temp. do fumes come out of the plastic? Will the sterilite plastic shorten my snakes life, like she said it might? Could some of you more knowledgeable folks who use or know about plastic tubs give me your opinion please, and thanks in advance.