Yellow leaves

The yellowing appears to be due to hot soil, nutrient burn from excessive chemical nutes. I personally would just move forward with plain water (reverse osmosis if available) until the plant begins to ask for nutrients. Young plants seldom need supplements when in any kind of potting mix which can typically feed an average plant for about 1 month per gallon of mix, heavy feeders on the other hand will likely require supplemental feeding later in their life, then start with 1/4 dose and move up if required.

Well u do have tiny amount of nute burn but other than that the tell lanky plants just need to be repoted

The soil is toxic to the one burning flush it flush it real good

i can only agree about lanky ones, they need more light ! BUT they need air movement too, to make theirs stems stronger, so from garden wire you can make support like i did here growdiaries.com/diaries/135979-grow-journal-by-asnoriu/week/737550 older ones, looked like clones to me too ;) anyway, they heavily overfed, i would consider to transfer them to final pots asap and not feed for few weeks even. All weed specialized soil has plenty of goodies for few weeks anyways. All the Best !

The tall ones aren't getting enough light - there's too much stretch in them so if you've got the light dimmed at all, brighten it up OR move the lights closer. The shorter ones are showing significant nute burn - You've got them in soil that should provide seedlings with enough nutrients to see them through 2 or 3 weeks and you've added even more nutritents to it with the BioGrow etc... I would stop giving them nutes and just water them with pH'd water for the next week or two. When you resume the nutes, start them off at 1/2 strength to see if they can tolerate them. The damaged leaves are NOT going to repair themselves so don't expect that... Good luck!

Hi there The seelings are stretching like crazy your light is either way to height or putting out poor light spectrum if its low, The others look like they need feeding or if there new cuttings dont look like there taking to well, Best of luck 🌱