First Grow Mephisto Sour Stomper Autoflower

One of my seeds hasn’t sprouted yet. I’ve placed a 3rd seed in a cup of water and I am going to put it in soil once I see the root stick out. The one seedling is about an inch tall. I lowered the lights to be 24” from the plant, measuring around 295-300 PPFD I changed the light to 18 hours daily vs 24. I picked up a small bag of mykos that I will use with the 3rd seed, never tried it before.