Hey there friend I would love to offer you some advice to help you out along your path to learning to grow if that would be okay with you? So cannabis plants love heat and humidity. It is the buds that hate it, If we capitalize on this in veg we can get much more vigorous and healthy growth from our plants. We should be looking for 80-84 MAX with lights on and no more than 9 degrees less when the lights go off. We want to keep our temperature gaps in veg and early flower nice and tight between lights on and lights off. If we allow for more than 10 degrees less at this stage with lights off it will signal the plants to stretch. We do not want that, I would look to warm your room up with both lights on and off temps. Also humidity can really help your growth rates by supplementing your roots intake with foliar intake from the humidity in the environment. It is especially helpful in the first 1-2 weeks. We can run up to 70% in the room with our plants and be okay. Although your tent is a bit dry, It is alright and if you cannot get your humidity up higher, Try putting a 3-5 gallon bucket in the tent with no lid full of water and it will help passively raise your humidity quite well, especially in a warm tent.
Look up VPD, Vapor pressure deficit and how it relates to growing cannabis. All new growers should learn this right away, Also if you have not gotten them yet get yourself a good PAR meter & a thermal laser temp gun like the fluke 62 MAX. These pieces of equipment will help you grow to your plants needs much better and get the most potential out of your lights. If you have any questions please do not hesitate to ask I am always around to help new growers out! Check out my diary of 200 lights 7,000 plants and follow my profile I will be putting out tutorials on my youtube channel soon aswell. Keep up the good work friend & happy growing!