Im having trouble with some black berry kush. I am running 32 plants off two 1,000 watt lights. I have my clones in a soil/ready grow mix planted in coco pots. I water once a day with a flood and drain technique. My problem is the leafs are yellowing from the inside to the tips on all new growth. I'm thinking a sulfur deficiency, but from what I know soils are abundant with sulfur. In case that is the issue I have top fed the past two days with epsom salt water. I really don't know if thats the issue. Feedback is appreciated.