it could be that your plants need more light spectrum now that they are getting a bit bigger, becuase if you're using a 130 wattage you're most likely using a cfl, correct me if I"m wrong but. But what thats doing is it's just making your plant grow it's length because the light is insuficient to make the plant produce. and possibly try watering it a little more than 3/4s of a cub once a week, I have some about 2 levels lower than yours and I water it every day but my water runs through the pots, it doesn't settle. Just my opinion on what I could see.