thanks for checking me out;/ the tips are burning because my area is small and they keep touching the lights, so its pretty much a daily chore of tucking leaves and moving things around to keep it under control. I've heard that about the purple stems but always discounted as like a genetic thing ... i will give her some magnesium and see what it does. And no i dont test the runoff;/ i dont even have a meter lol i just ordered a few seeds to give it a try. But i definately got the bug now , lots of reading , learning , and experimenting has me ready to invest a little. Whenever i get ready for my second run i have a barneys farm pineapple chunk fem, im thinking of trying . The latest thing i got was a 250x scope to check trich's when i get that far.Lookin pretty good bro. If the tips are just slightly burnt or yellowing, you know you're at your max on nutes. I don't stress when I see this, I just know not to push it from there and to maybe do a flush or res change at that point. Purple leave stems are the early sign of magnesium deficiency. Mag def. can really take off in a negative way if not treated. Mag requires a Ph of 6.5 or higher to be absorbed in soil. I'd personally mix up a little cal mag into your next watering, Ph it at 6.8 and give it a little drink...not a soak, just enough to let it absorb the mag. Do you test your runoff water for Ph and ppms?