1st Grow, Holy Grail Kush, DWC w/CO2

Id like to start this diary off by saying thanks to the growers who have already helped me by answering my many questions and thanks to the ones who will answer many of the questions (some embarrassingly silly) to come. I do appreciate your time, and look forward to learning enough to repay the kindness down the road when I find myself on the other side of the smoke. Special props and gratitude to @RUSSRAHL for ending my 2 week struggle to see the three little dots that let me update my germ and first veg week, and doing it without pointing out that it was right in front of my face and while they would never suggest someone stop chiefing, maybe I should slow down a little bit :) So, without further rambling, I'm finally ready to start the first grow! I started 15 femenized Holy Grail Kush seeds by DNA Genetics. I'd like to grow 12 plants so I figured I'd germ a few extra incase some didn't make it. Germ Day 0 I put them in R/O water with 0.5% hydrogen peroxide @ 5.8 PH and 75.5 degrees for 23 hours, kept on a seedling heat mat and in the dark. I also presoaked rockwool cubes in low PH R/O water to begin prepping them for the seeds. Might be a little early on that but they'll be stabilized in time for sure. Took a day to remember to keep them in the dark so they don't grow algae though. Hopefully it wont be a problem, I think some H2O2 might help prevent that too. Germ Day 1 After 23 hours, all the seeds sank when pushed below the surface of the water. One was already splitting and revealing the taproot and the others all looked swollen. I placed all the seeds between paper towels on a plate and sprayed them with R/O water. I put the plate on the heat mat (I put two folded rags under it over the course of a few hours as the temp increased to 80 degrees) and kept them moist but not soaked, with the humidity dome from my germ tray over the plate. I also turned the light on in the tent, dimmed down to 20% and reading 25 PPFD at the top of the paper towels. I assume that's enough for this part of the process, no clue really though. They are currently in the 5x5 clone and seedling tent I set up, I expect to have the 5x9 veg and flower tent fully set up within the next week or so. Germ Day 2 24 hrs after being put in the paper towel all seeds have a 1/4" to 1/2" taproot showing, a few are 3/4". I planted them in rockwool cubes and covered them up with a small tuft of rockwool. I widened the holes in the cubes slightly with a sterilized dab tool, they looked small to stuff that seed and root down in. Next time I will warm the cubes before transplanting, I worried about the temp change going from the paper towel to the cold cube. They warmed up to 77 degrees within a couple hours on the heat mat. I lowered the light to 2.5' away (can't remember where I read how high leds should start from seedlings) and set the PPFD to 100. Germ Day 3 Holding temp at 77-78 degrees and misting cubes every few hours to maintain 90-95% r/h By noon one seedling has emerged and is shedding its shell and what I think is the perianth referred to in my cannabis horticulture book. By 10 pm almost half the seedlings are emerging. I'm ending germ and moving to what I'm calling seedling week 1 in my own records.