Abnormally small and yellowing 18 days.

Here are the worse babies. They seem super small for 18 days. I have given a couple feeds of GH….1ml calmag, 1ml micro, and 1ml grow (325 ppm). Medium is soil, happy frog perlite mix, with a bit of worm castings. Light is LED dialed down to 20% at 24” height. What do you think the yellowing deficiency is? The only thing I can figure that they are not getting nutritionally is phosphorus. I can add in 1ml of bloom to remedy that and still stay within the PPM of under 350 for seedlings.

I always start with equal amounts of micro, grow, and bloom.

What's your temperatures?

How much water / how often? Also what size is the pot.

Off the bat it’s tricky to diagnose. Soil has nutrients, as do worm castings and you’re feeding them.

With the small size they are I think it’s environmental cause plenty of food to be found