Hi im having trouble with my grow and wondering if any one can help me out please . This is my 3rd grow, all my grow seems to have this problem the lower leaves go yellow and fall off. although my last grow the yield was ok im sure they must have something wrong for their leaves to fall off ( during veg). They are about a month old give or take different breeds too but all showing the same problem. they are in biobizz all mix with a small amount of added perlite. im feeding them biogrow 2 feeds 1 water ( ive just reached max strength of 4 ml per litre 2 days ago + i added some epsom because i think it might be a mg def). the new groth seems pretty healthy altho 1 plant does not look as green as id expect but the others are fine. PH wise i believe they are fine, i did have a ph meter and was using 6.5 then my ph meter dies and starts going manic. anyways i know my tap water is 7.1 ph so thats what theyve been getting since. im using 150cfl on 24 hour its about 2 inches above the plants. the temps are rather high between 86-94 ive seen but it was a hot day. usualy about 86-90 i know this is high but i managed to get some decent bud at this temp before its not ideal but i cant do much about it at the moment. theyve had a fan over them their whole life and a small pc fan bringing air into the cabinet. im not sure what else to add but thanks in advance for your replies. a few pictures of the prooblem.