I current have 4 blue mystics growing in soil under 2 90w leds. I'm have a problem with the new growth. It seems they are turning yellow but the veins are staying green. I assumed it was a maganism problem so I added 1/4 teaspoon of epsom salt per gallon of water and split the water evenly between the plants. It seemed to help, but didnt solve the problem. Several days later, I watered with magenism again as described with some improvement, but the problem still exists. Any ideas what going on here? I'm ready to flower, but am holding off until I get this problem solved.