Yellowing leaves on Seedlings.

Hi,

I have a grow room of one cubic metre, with two 150 Watt HPS. I have six seedlings and they're each a week old.

The leaves have turned half-turned yellow, and the new growth is yellow. The temperature is 25-30 Celsius, humidity of 50%, and I spray them a couple of times a day with tap water. They're on 18 hours of light.

I attatched some pictures.

Anyone know what's wrong?

You should not spray them. You are flushing all the nutes out and possibly over watering. Both will cause yellowing.