Hi, like Terp1 has said, your plant seems to get too much Nitrogen and roots seems to have been overwatering. What i suggest you, let the plant some days without watering, and wait for the soil to be dry. After some days when the soil get dry, just water with only water (without nutrients). The plant will lost this "green" look after few days.
Cannabis plants like to have their feets in warm surroundings. Less than 20°C, the soil will take to much time to get dry. That's why we recommend a temperature of 24° on the top, It imply that the bottom of the box is near 20-22°C.
Have a great day, good luck for your grow.
420