Autoflower yellow leaf problem!! help!!

Hello guys, ive got 1 autoflowe bubbleicious and 1 autoflower super skunk in biobizz all mix, waters ph is around 6.0-6.4.
They are a week and a half old now and ive noticed that some leafs are going yellow and pointing down, my last grow with autoflower was really good and i got 30g dry of 1 lowryder2, the only thing ive changed in my set-up is the soil, is it possible that this soil is too strong and my plants getting nutes burns? or what do you guys think it is?
here are some pics

I think you've got nute burn from some heavily 'treated' soil. Seedlings are more sensitive to nutes so at this stage, what you're seeing, isn't a surprise. I'd say - just leave them be in the pots they're in and water as needed with no nutes. In a couple weeks start adding a weak solution (1/4 strength) of nutes and increase from there as needed.

GL -- bioWheel

bioWheel said:

I think you've got nute burn from some heavily 'treated' soil. Seedlings are more sensitive to nutes so at this stage, what you're seeing, isn't a surprise. I'd say - just leave them be in the pots they're in and water as needed with no nutes. I a couple weeks start adding a weak solution (1/4 strength) of nutes and increase from there as needed.

GL -- bioWheel

Click to expand...

yh thats what i thought as i havent been feeding them with anything and the soil is pretty strong, at the moment im just feeding ph'd watter and i will start half feedings with nutes in about 2-3 weeks. thanks for the advice