Some of the leaves on my gal are gaining a purplish tint, probably been like this for about 5 days or so now. The tint seems to be coming in just a little little more as the days go on. There are also some purple stems. My grow specs are listed in my signature. Is this a phosphorus deficiency?? If so, any suggestions? Another little concern I want to throw in..New leaf growth have yellow/brown tips(the very tip, and only the tip). After some research i attributed this to heat stress maybe?? Temperature ranges from 70F(lights out) to about 82F(lights on). I do not know the pH. I water with plain distilled water for every watering, including my tea mixtures(tea mix only contains Happy Frog Fruit and Flower with 1/2 teaspoon of molasses per gallon). I water till runoff, approx. 32oz of runoff or more every watering. Let me know if anymore info is needed, here is a pic of the symptoms..purplish tint on leaves and some yellown/brown tips. This is day 39 of her life, expected manufacturer harvest is 55 days.