Big asS Tent grow!!! need advice!?

As far as I know it has only been PVC that has cause the plant toxicity issues. I have never heard of any plants being killed by the Secret Jardin DR series and they use that mylar type coating.

Personally I prefer the Homebox, but I would say the Homebox and the Secret Jardin Darkrooms are the best, safest tents on the market.

Yep that is what I heard about the mylar tents too.