burnt edges, yellowing, drooping

Young clones yellowing, drooping

I picked up 5 clones, 3 different strains last week at the coop. SourD, Green Crack and og kush. The 2 sourDs are drooping and there is yellowing of top and bottom leaves. The yellowing isnt focused on any particular part of the leaves. I transplanted them when I got them a week ago. They are in a tent with a 600w mh about 18 inches above on 24hrs. A portable ac keeps the temp from 80-85 and the humidity is sorta low at 30-40 The other strains look great.

Why are these plants drooping and yellowing? Also the tips of the yellowing leaves are turning brown and crisp. I just gave them half dose of Foxfarm growbig.

Any suggestions?​
 
Please don't double post, I replied to your other thread.
Sorry about that, I though I posted it in the wrong section/category. Thanks for the reply by the way. Here are pics I got online that look exactly like mine. When I get my iphone I can post updated pics.

About the flushing. When I transplanted I drenched the 5 gallon pots with water. With a gallon of purified water. If it needs to be flushed with more water it would have to be tap. But the tap water here is very alkaline ph 7 or 8! The soil was really dry when i got them.

About topping...

I have never topped a plant before. Can I use scissors? Where to cut?
online pics2.jpgonline pics1.jpg
 
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