ILGM OG Kush - Living Soil

Things are progressing well so far. New light (Viparspectra P1500) was installed in the tent on day 7. I used my light meter to keep the light levels right at around 300 PPDF at the tops of all the plants. Could see a difference the next day. All the stalks had straightened out nicely and they've stopped stretching towards the light nearly as much. Lights levels are about the same as before the the direction/distribution , and spectrum of the light is much better now. I had been running the lights on for 24h since they sprouted. On the evening of day 10 I swapped the lights to be on a 19-5 schedule as I felt I was pushing them a little too hard. The browning I was seeing on the first set of leaves has stopped since I lowered the light intensity last week on all but one of the plants (back left). It's not browning anymore, but the new growth continues has some colorations that don't necessarily look to be heathy. I'll keep an eye on it. I'm looking to cull one to two of the weaker plants before I swap tents in a few weeks anyway. Been watering with 1ml/gal of cal mag every other time I water to start with. I've also watered with EM1 and the Mammoth P once each at this point and will continue to do so once a week. They're really starting to take off. The new growth is noticeable each day. I'll be looking to top them here in the next week or so at the 4th or 5th node.