Hey guys, I have an issue with my lettuce. Some of these in the picture are herbs, but mostly lettuce, and mostly giant caesar. They all tend to wilt over like this, and the leaves are not crisp. The roots, while I do see them coming out the bottom, are not plentiful like in other pictures I see. This is the second round. The first round I harvested, but turned out the same way. My nutrient solution should be all right. About 700ppm, GH MaxiGro. PH is steady between 5.9 and 6.1. I have two airstones. What could the issue here be? I'm using 3" netcups filled with hydroton, and popping my seed starters in the middle. My styrofoam is only an inch thick (couldn't find inch and a half at the stores). Also, I have this under a 600W HPS light. Not directly under, I have some veggies plants directly under, and this only partially. I figured it would be ok since lettuce doesn't need that much light.