Hello everyone!
Thank you all so much for your continued help. I have another question. I’ve added a fan to my grow room to help my 3 week olds strengthen and give them movement. However, since I’m using HLG 260 XL 2 Quantum panels for two babies. The lights just don’t get the space hot enough. With fan the pot temp is 66 degrees. Without the fan, it’s 69-70 degrees. Do I need the fan? Is it okay to leave it?
I have multiple fans in my grow tent. Silica and there in another thing you can use to help strengthen up the branches. @Myfriendis410 knows. 
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If you exhaust air out of your room then try turning it down to keep the current air in there longer. Or heat up your lung room that you bring air in from. Also with silica, it’s good for strengthening stems but if you plan on doing scrog training or bending them around I would just use the fan to harden them off.