Quote Originally Posted by Th3 sand m4n
its probally that they dont get fresh air. Plants release gases out of the stoma on their leaves, over a while ( about 3 weeks) in being in a box with no fresh air they will probally die. I really think this could be your problem having a fan will not help the situation much just blow the air around. if this is not your problem im am seriously going over to your house and growing your plants haha this makes me sad
Exactly... fresh air would be good.

Again, not a fan moving air around... no... actually *fresh* air.