Hey friend clean looking tent. Would it be okay if I offered you some advice to help out? Cannabis plants love heat and humidity. It is the buds that hate it, If we exploit this in veg we can get much more vigorous growth out of our plants. Your temps are a little on the cool side right now, I would aim for 80-82 lights on and no more than 9 degrees less with lights off. We want those temp gaps tight at this stage or we will get unwanted stretch. If you do not have them already get yourself a PAR meter & a thermal laser temp gun to better read your plants and grow to their needs. Research VPD, Vapor pressure deficit and how it relates to growing cannabis. Check out my 200 light 7,000 plant diary & follow my profile. I will be putting out a youtube tutorial series soon so sub to my channel and stay tuned for that! Happy growing friend.