First times a charm - zkittles auto dwc

Some nice buds starting to fill out. Added uvb light to boost trichome production, 15min in morning 15 min at night, slowly adding more 15 min periods though out the day. Bumped ppm of feed up to 750 until one of the plants started to show signs of stress on the tips of fan leaves. End of week the darker plant is started to go frosty and the buds are much fuller. I drifted up to 800ppm mid week and both plants starting to show signs of overfeed on the tips, backed off to 720ppm and staying there.