Help pls anyone.!!.1st Eva grow.!!.got 2x4x5 tent with 2x auto's (3rd wk,)under 2x 300 vipa Leds in coco/perlite 4gal smart pots..add cal-mg probs think I have sorted now.!!..but should I pick off lower affected leaves or should I just let them be & let them drop off naturally..??..