Yellowing/growth advice (I'm pretty colorblind)

Alright, these sprouted on the 8th. Growth was fast, now seems to have slowed or they got stunted. The smallest is an auto, the others are regular. I'm thinking too much or too little nitrogen?

They were started in peat pellets(mesh cut off before seeds sown)
Water ph is 6.3-6.5
RH is 50% and above
Temps never higher than 81F
One 5500k CFL and 2 leds fixtures.
Oscillating fan.
Soil is locally sourced organic potting soil that has EWC (plus some extra) . Some mushroom compost and perlite.

The yellowed and wilted one i see now has roots just starting to poke out the drainage holes in the bottom of the cup, the biggest one doesn't. I'm thinking i should transplant now into bigger pots and or a different soil?

I have live soil curing now for when they get bigger.

I had the same problem m8, deformed leaves, yellowish, and so on, it's ph fluctuations, you should keep your ph at 5.8 veg and 6.2 flower
good luck and happy growing

Thanks for the help, hm i thought i remember reading soil would Ph itself to an extent. But i do have some ph down i can use though.

Let me pull it out the soil with my mouth and eat it.
The yellowing has something to do with the soil. It happened to me I just changed the soil and the leaves didn't turn yellow no more.

First ,, get them out of those cups.
Next it seems the soil isnt cutting it for PH control - it cant control even the amount in the cup ...... If you have to " use " that soil ... amend it with dolomite lime.

You can Amend a separate batch for replanting.
But the EASIEST FIX ...

Transplant into a premium mix and let the embedded nutes in that soil alone bring the growth around. Autos hate stress and can stunt ...especially in early veg. They dont have time to RECOVER and could cost you yield. Autos are PLUG AND PLAY ... Its best to plant in its final size from the start and let it grow WITHOUT a lot of fuss or feeding. Most soils can carry a plant well into week 5/6 WITHOUT ADDED NUTES.

Dang.. Really didn't want to have to get more soil.. But I'll see what i can find locally. As for the Dolomite lime, what ratio should i amend with?

Any idea who the soil isn't PHing itself? What would cause that?

Yeah the soil too wet or it is uneven aeration, possibly both watering habits plus soil aeration. The soil doesn't seem to be providing nutrition to the plant I'm not sure the compost went well.

Thats the mystery about your soil source ... It could deficient or excessive.
Example .... Lime can Raise Ph , Sulpher can lower it.

How often you watering?

I've just been watering as needed, I'll poke a finger in the soil and if it feels dry almost all the way through I'll water.

Well i hope the 4 cubic ft of soil i have amended and cooking isn't gonna be jacked up, guess i need to add some lime to that now??

Alright I got some one gallon pots, Espoma organic garden lime, and an 8 quart bag of (don't flame me) miracle gro, nature's care organic potting mix. I've read its decent and was the closest available premium mix.

Oh and for shit and giggles seeing this outside my house ticks me off when i can't get plants to grow indoors under ideal conditions