I'm hoping someone will be able to tell me what might be wrong with my plant. This is my first grow and I'm not sure what could be wrong. I've searched the forums and I see other people with similar problem descriptions but the pics never quite look like mine. Heres my grow info.. Kannabia Special Autos Growlab GL80 400w HPS on 20/4 Temp stays around 68-70F Humidity usually around 47-50% Fox Farm soil Tropf blumats for watering This is around day 30 For this grow I opted to not use nutes. The tips of some of the leaves on one of my three plants appear to be yellowing a bit and curling down. This is mostly on the new growth on the top, but a few of the lower leaves are also yellowing a little and curling. My second plant looks mostly OK but a couple of the leaf tips do show a little yellow. The third plant looks fine, but its a few weeks younger than the other two. It looks a lot yellower in person than it does in the pics. Thanks in advance for any help!