Full Tent - Indica Hybrid - First Grow

Hello All, Welcome to my first grow journal. This is my first time seriously growing and this site is the only place I've posted any grow too, so here we go! ***Disclaimer - I am posting this grow retroactively Week 1-4 will be posted simultaneously*** I started this round on 11/30/17, germinated 9 bag seeds in between two paper towels in a zip lock bag and sitting on a heat mat. All seeds popped within 1.5 days and were planted tap root down in ffof (Fox Farm Ocean Forest) in a seedling tray with humidity dome, watered in with RO water ph'ed to 6.6. After another day or two 6/9 seedlings broke through the soil and humidity dome was removed a few days after that. This grow was started using a 25w actual blurple LED panel but quickly decided to swap that out for my MH. I dimmed the ballast to 600W and hung at its highest setting for the tent (approx. 60"). I know it's a waste of light, but the room needs heated anyway and this way I can dial in the tent, this being my first grow and all. I'm doing veg and flower in the same tent this first run, but I'll be using a veg tent for future grows and t5-HO fixtures for light. My current grow started and will finish in a tent 4'x4'x80" standard uni-zipper mylar grow tent. Due to this grow coinciding with winter I opted for a 4" 200cfm exhaust fan for the sealed MH fixture and am using a desk fan on top of the tent to pull out enough air for ventilation. With low humidity in my area the tent utilizes a cold mist humidifier to keep the humididty up, for the lights a small heater. I've made plenty of mistakes in the first week, including... transplanting too early, having the MH light too close, and overwatering at least once. Having said all that I've managed to keep all 6 seedlings alive the first week and have continual growth, either above or below the soil.