Thanks for this info nctomatoman. Before I read your reply, I did just that, using scotch tape to hold down the plastic wrap. I noticed that the middle germinated but not around the edges, probably because heat mats were warmer in the middle and the colder air around the edges makes germination slower.
I have a new question of you. Are the fans needed because of the heat coming from fluorescent lights or to make the seedlings strong? If one uses LED lights, do you still need to have fans on the seedlings?? I am using both types of lights this year.
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