Why are buds sights so light colored? It is 6 weeks old and I just flipped it to 12/12 two days ago. The leaves look good and are dark, but tops are yellowish. It's in a 2x2 with a 140W quantam board led at 24". Feeding it Mega Crop at 500 total ppm every other feeding as of now. And maintaining soil at 6PH. They are planted in 5 gallon grow bag in Happy Frog.