Hi,

I have a grow room of one cubic metre, with two 150 Watt HPS, and have six week-old seedlings in soil. The leaves have turned half-turned yellow, and the new growth is yellow. The temperature is 20-30 Celsius, humidity of 50%, and I spray them a couple of times a day with tap water. They're on 16 hours of light.

I don't have any pictures just yet, I'll try and get some tomorrow.

Anyone know what's wrong?