Holy Grail Kush and Pineapple Express

This grow is starting in a 2' x 4' tent and will move to an open room with 2) 4' X 4' trays with each having a 20 gallon reservoir. Seeds were germinated using paper towel method on Nov 11th and were planted into 1.5in rockwool when roots were showing on the 13th. Most plants popped out of the rockwool on Nov 14, with the last remaining popping out by the 15th. started seeing roots from the bottom of the 1.5 inch cubes on the 17th, so I transplanted into the 4x4 rockwool ph'd to 5.5 with a tiny scoop of great white and Clonex clone and seedling nutrient solution at 320 ppm in RO water. This is my first time using co2 and I am using a 20 pound co2 tank with regulator and a digital co2 monitor/controller. Not sure if this was the right thing to do, but I started the co2 as soon as the seeds popped out. They have been at 950 ppm with the tent sealed and just a fan for a small breese. The 2 viparspectra lights are around 15 inches away from the plants, and only have the "veg" switches turned on The one rockwool cube with no sprout is a Northern lights autoflowering, but I don't think it's going to pop.