well purple stalks arnt the end of the world. Certain strains may exibit this thru the whole life of the plant. However many do believe tht its a sign of health issues or lack of nutrients. The twisting and odd looking top growth may be a sign of several things. First of all get rid of the mirrical grow if you wanna take this seriously. And if you live in a shitty east coast or southern state than you already are if ya get my drift. Anyway, somethin as simple as SuperThrive should do the trick. Which you can get at most hardware stores, if ya dont shop at our beloved hydroshops. The mirrical grow is compiled of mostly nitrates{animal waste]. Which amounts to low quality nutritional benifits for a high quality plant. Let em dry out, feed em with water a time or 2, then get a better nutrient feed. Something not meant for commercial applications. Try your local hydroshop if ya got 1....