Plants are in compost with added innes,veg used fert with npk values 10.6,4.4,1.7 bloom used vitalink earth bloom npk 2.2.4 been very careful with feeds always under and more often than stated mixing 50-66% strength as directed by shop boys..All signs point to mg def but remidies havent worked if it is a nitrogen def could i use dried organic blood to top up N ?.Also two varieties in N/lights and Cheese the N/Lights seem to be worse affected and it started with the 3 larger plants 1 being of the cheese variety. Will test Ph later as they are down for the night..bless any how thanks for the advice so far please keep it coming by the way buds dont seem to bad will include soom pics of those later