Free seed

This is my first Grow. I am learning and started out 12/12 for about 6 weeks then changed to 18hrs on. My free seed (super skunk) is showing signs of being a female. She is in dirt. My OG Kush regular seed is not showing sex yet. It is in hydro. I use a small frig. to cool the water to 63* - 67*. I have a small water pump in frig. pumping to plant (drip system) and a return hose at bottom of bucket. Room temp kept at 75* - 80*. adding nutrients as on label for veg. stage. tomarrow I will change lights back to 12/12 and add nutrients for flowering stage. I change water out every two weeks. I spray plants with soda water for CO2. if anyone has any good ideas on nutrients and lights please advise.