GoG Kosher Kush. Soil. Marshydro tsl2000

It has been 14 days from popping from seed now. They all popped up within 24 hours of each other. Closet that they will be growing in is approximately 2'x6'. 4 Garden of Green Kosher kush in Happy frog soil. Thinking of adding extra worm castings and possibly a little 4-4-4 gai green all purpose when I up pot them to 2ga pots within the next week. Any thoughts? They seem really healthy right now so I am hesitant about adding anything extra. It is my first time growing in 4 years and my first time using soil. I intend to top twice, use some LST and start spreading them out when they get a few more nodes. Lighting is marshydro tsl2000 and it is set at 300W right now. I let water sit uncovered for a couple days to get rid of the chlorine. Add a few mL of vinegar to water to reduce ph below 7.