help needed with leaves pics

my friend brought these leaves round yesterday they are growing in cheap soil
i am only new at growing and don't want to give wrong advice so i would be thankful if some one could tell me what is happening to these plants


they are in cheap asda(uk) soil
water ph-ed to 6.8ish
under 3 125w clf envirolites

o yer they are 3 weeks into flowering

the leave were only off the plant 10-20 mins before i took the pics
they were already curling up at the end like aladins shoe

any help i would be truly thankful

Solution to fixing a Manganese deficiency
Foliar feed with any chemical fertilizer containing Mn., or mix with water and water your plants with it. Any Chemical/Organic nutrients that have Manganese in them will fix a Manganese deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!) Other nutrients that have Manganese in them are: Manganese chelate, Manganese carbonate, Manganese chloride, Manganese dioxide, Manganese oxide, Manganese sulfate, which are all fast absorption. Garden Manure, Greenssand are both good sources of manganese and are medium/ slow absorption.

Your ph is abit high also try to get it down as that will cause the Manganese deficiency 6.0 would be good.
It sure looks like a classic case of mag deficiency to me..

Thank you G&C i think i have some mag cal which has chelate Manganese in it if it has i shall give him some of that to use thanks again