plants need help

hi all i am new to growing this is my 2nd grow first grow i got 17 ounces of dry weed wasn't the best tho it was airy temp did get real high tho like 99f. My set up is a 1.2 x 1.2 x 2.0 grown tent in my garden shed with a 6" extraction fan with carbon filter 4" inlet a 8" fan blowing the heat of the plants 600w hps light and i grow in canna Coco Coir Pro+ 10 liter pots

Im growing 4 silver haze got them from cuttings started them on 1-11-14 and was told ready for 1/4 Strengh feed with coco a+b 10ml in 10 liters of water i feed every other day and just increased the feed to 15ml to 10 liters of water and seem to be getting some problems just need to know for sure if it's nute burn before i flush them don't seem to be burning just rolling over and folding in half thanks for the help in advance temps with light on 74 - 81 humidity 55 - 65% lights out tems drops to 68 the lowest it has been and humidity drops to 46%
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Looks like you have clawing, taco wing and the tips look like they got burned. Back off the nutes for sure. Try easing into the nutrients more gradually. Are you measuring your tds/ppm? Tap water or distilled or RO?

no i dont have a TDS Meter but i will order one in a bit do u think i should give it a flush or just back off with nutes on the next feed

I don't grow coco, so I will differ to someone with experience with the medium. If you can pull one into natural light it may also help get a good picture.

ok ill have to do that tomorrow when the light comes back on there isnt any colour fading or any think they look healthy within the colour well to me any way and i use tap water witch is about 8.2 but i use ph down to get it to 5.5/6.0