they are yellowing and curling plaese give me advice hears the link http://forum.grasscity.com/grow-journals/160275-morbazons420s-top-44-grow-under-400-watt-mh.html
What are the temps in that cab? 400w MH in a 2x2 area is pretty hot imo. How often are you watering? I see you dont have a ph meter yet.. get one