Grow space is about 4ft x 5ft wide and about 10 ft tall. Have two home-made DWC bubbleponic design systems that hold 3 plants each. Each tub is 25 gallons with 15 gallons of water in each of them. Each tub also has two 4 inch circular airstones. I'm using a 400 watt ballast, with a 55k lumen MH lightbulb for the veg stage (4 weeks) and then a HPS bulb for the flowering stage (8-10 weeks). I also installed 2 inline 8 inch 600 cfm suncourt fans for some ventilation, the intake duct is down low and the exhaust is up high above the light. I'm using the Flora 3 part nutrient series, and also a root enhancer and KoolBloom for the end of the flowering stage. In these pictures the clones are 1 week old, and I think the two on the right are drooping a little because I was over watering them a little too much with the pump, but I changed it and they are looking better.

The temp goes as low as 56 degrees F at night, is that too low? should i turn the fan off at night? just reply right below this, its alright.

Yeah that's too low. Get a little heater in there or something.