young plant with yellowing new growth

Damn that's pretty extreme. I figured that would stunt them. So is his ph a little too high?
 
The heat did stunt them but not as much as I was expecting, still got about an ounce dry from all of em in 2 gallon pots...

Yeah PH is a bit high, maybe bring it down so the runoff is around 5.9-6.3, but I can't for sure say that is the problem yet.... We'll have to see some new growth after adjusting to be sure that's the issue.... It is possible although not too common that the plants are just weak seeds that have built in deficiencies for one reason or another, however I don't think I've ever heard of these complaints from any JEMs, they're strong growing plants from my experience and others...
 
Ok I am going to cut the 400w and just run the 300 w led grow panel to cut down on the heat hope that will ne enough light. Anyway I have 13 plants and they all have the same yellow New leaves. Have three afgan kush Ryder, five Russian rocket fuel, and five Il daivalo. Going to get a better ph meter and some ph down. Any recommendations on ph meters?
 
Probably PH. Even large swings in PH while they are young can do great harm. It should come around, won`t be a monster though.
 
Update: ok i have turned off the 400W MH and am only running my grow panel pro 300 LED light. It has cooled the temp in the tent down to 78 degrees F. The New growth is turning back to a vibrant green and pushing the yellow out. I agree with bailerbud and need to fix my ph but will be a couple of days before I am able to get to the garden store because of my terrible work schedule. Does anyone know if my grow panel will provide enough light to cover the 4X4 tent adequately? THANKS in advance.
 
Does anyone know if my grow panel will provide enough light to cover the 4X4 tent adequately?
That would probably be pushing the envelope at the very least. I would think that size might be better suited for 3'x3' based on what I have seen. :peace:
 
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