Hi Guys, I need some help with my sick plants They are around 4-6 weeks old grown from seed. I've had trouble since adding the nutrients after around 2 weeks. The growth is very slow, the ends of the leaves start to yellow followed by burning of leaf tips and margins (older leaves first). Newer growth looks more healthy but with some darkening in the middle of leaf veins. I am using GT coco grow parts A+B @ 1/4 strength. Not sure if it's nutrient burn, over-watering or pH imbalance. Any help would be appreciated. Grow info: Grow tent: 1m x 1m x 1.8m Light: 400w HPS, plants 70-80cm from lamp pH: ~ 6 using colorimetric indicator (balanced with lemon juice, solution goes up to 7 after a few days. Will start using commercial pH down) Nutrients: Growth Technology Coco Grow, Parts A+B, 1/4 strength Temps: Very High, up to 35c, avg. 30c Humidity: Very Low, 30-40% (any ideas to get higher???) NB: I was still having the same issue when growing under fluro's where the temp. was in the good range 24-27c, and humidity between 50-70 %. Plants 3&4 are next gen. romulan Plant 2 is likely romulan Plant 1 is romulan or Nirvana's Chrystal
the plant has nutrients in to grow for 3-5 week without the need to add additional nutrients. anyway, looks like the plant need water, and how close if your light?