Just noticed that one of my Lowryders' tips of the leaves are turning a dark purple color and it is slowly spreading farther down the leaf along the edges. I believe that this problem also occurred in my last grow but I could never figure out what was the problem and it eventually caused the leaves to become brownish, brittle and having to harvest early. I'm positive it's not because of cold temperatures because these are running on a continuous light cycle and cabinet rarely goes below 67. What type of medium; soil or hydro?- soil What brand and type of soil? - FFOF/FF light warrior/ perlite/ N guano Indoors or outdoors?- indoor What strain?- Lowryder 2 How old is the plant?- 35 days What is your watering frequency and source of water?- Every 4-5 days, distilled water with cal mag added What, how much and when was it fed?- Fed 4 days ago with 1 TBSP of Big Bloom and 1 tsp Tiger Bloom What is the medium/runoff pH and PPM if in hydro?- runoff is about 6.1 right now, I've added lime and slowly bringing it up What are the temps and humidity in the room?- 75-80 F/ ~30% humidity What size pots?- 1 gal. Any bugs? Look real close. None. Pictures will be coming soon. Any help is appreciated.