ok can anyone tell me whats wrong with this or how i might fix it. yellowing started off at the bottom of plant and few leaves have wiltied and died off and the yellowing is moving upward. the branch connecting the leaf to the main stem turns a purplish color before falling off. using distilled water now and have beeen for little over 2 weeks. have peters 20-20-20 and expert bloom 10-52-10. used peters twice during veg state and once during flowering and expert bloom once during flowering.