hi please help ive got 3 chronics which are two an a half weeks into flower and are showin sum nice buds and are lookin realy nice but on all 3 plants the branches connected to the fan leaves have gone a shade of red. it doesnt seem to have affected the growth and the leaves are a dark green ranging from seven nine and eleven fingers. They are under a 600 watt sodium hib the grow room is 2 by 2 metres well ventilated with a temp of around 23 to 26 degrees and humidity is around 45 to 55. Oh and i am using house and garden a and b for ferts in 14 litre pots in soil. Any help would be much appreciated.