Hello, I'm growing Genovese Basil hydroponically in vertical towers and they all started off great and were very perky for about a month. Over the next month they lost their perkiness and started showing spots. Most are transparent, which are the ones I'm concerned about. A few have light yellow/brownish edges which make it seem like they are too close to the light. I am using a Apollo Horticulture 300W LED, and placing it 5 feet back. It was closer but it was burning my plants so I keep moving it back. Any ideas?