I think its mostly me and tryin to find the sweet spot while takin in information from multiple sources. I used AN when I first started and had good luck till I ran out and switched to GH and things went haywire. Again its gotta be me. This is my first hydro from seed attempt I guess I should be happy they arent dead. I am running stupidly low ppm for flower, 250, gonna once again start bumpin it up slowly, cut back on the N and increase the bloom nutesAll new growth starts out a lighter green, and purple stems can have many causes but I've never heard it attributed to a low nutrient level before? If you're having trouble with GH wait till you switch to AN!! -good luck!