I have been vegging for 6 1/2 months. My partner quit on me and he knew most of what to do. He left a couple months back and I have been stuck trying to learn everything I can as quick as possible, but around that time I started noticing yellowing spots on the leaves. I thought some noots may have splashed on them but they continued to worsen, now the leaves are weak and a lot of the lower ones are dry and yellow and some even dead in spots and the tips. I have no clue where to begin to fix the problem.I have a 1200 watt LED and am using the humboldt basic nutrient line. Along with silica and cal mag. I was using 15-10-10 ml of grow, micro and boost. But since they are massive I switched it to 5-5-5-5-5. At first I thought it was just a low light problem since they were so big and I had more than I should have under one light but I took some out and it is still happening. Can anyone help me out?