the problems with tents came from the hydrohut ones, apparently they were made in china and they gave off this gas that was toxic to plants... i had one and let me tell you it was true, they barley survived, i got a secret jardin and it kicks ass... stay away from HYDROHUT, they are junk, the guy at the grow store said that it only effected a few models, i think it was the xl and the 4x8 one but who knows, im never going to buy anything from them again