Green House Seeds - Kings Kush DWC

She wasn't at all impressed by my upping of nutrients at the beginning of the week however by day 5 I'd decided to remove the Browning leaves and she perked back up. Whilst changing the water today I noticed something has taken off a large portion of the root system, which could explain the slow growth. I've moved the light as close as possible without being too hot. Always open to suggestions and thoughts as usual