Dude if he used miracle grow potting soil the p.h. is fine! The P.H. of the tap water could be your culprit and too much of it.(I've got horrible hard water where I live) Your soil looks way saturated. Try repotting them in something with no fert additives. "No feeds for up to three months on the bag" But miracle grow does have a guaranteed P.H. analysis on the bag itself. They just look way to wet. And good god man go spend a few quarters on some good filtered water from the store! Do you drink your tap water? P.H. meters.....Bahhhhh! F'n Nerd! Save it for the dro. It would have to be a drastic P.H. problem. Tell me if the yellowing leaves get crispy! Then we'll have a definite answer. I think your getting root rot and it's begining to show. I bet if you pull one of your plants from the cup they are not as white and fuzzy as they should be.(I use mircorhizzal and hizzae benificial bacteria that help correct minor nute problems and create a more root freindly environment that helps in the availability and absorbtion of nutes) I want them to be o.k. so trans plant them into some thing with less water saturation.Good luck my freind. All you need is an attentive eye and alot of practice. And all will be well. It doesn't look like burn. Chemical burn is more uniform and is usually seen around the edeges and veins of the leaves. Try a transplant and a dose of Superthrive(follow the directions on the bottle) NO FERTS! Then let them rest! I only micro grow in closets to breed. Then I test them all out in my backyard big top! I can't wish you enough luck on your venture! Let us know if your problem gets solved.
Wow, I have never seen such bad advice in my life.
PH is one of the biggest problems new ggrowers face.
PH can cause all kinds of symptoms from yellowing to drooping.
Do you know what else helps in the absorption of nutes? Yep u guessed it, PH...
Miracle grow guarantees PH huh, so if u water with 8.0 ph it will be fine because it's miracle grow. STFU!
PH testers can be purchased for $5-10 at any pet shop. Just get the litmus paper if ur growing in soil. Don't listen to this moron who says PH doesn't matter, because it is very important to healthy plant growth
