Green house grow

Ok I'm hoping someone can help me. Everything was looking good a little magnesium deficiency and that was about it. The I stared nothing that the girls were pulling back on some other nutrients' since I'm spraying them every morning with some calmag and the yellowing isn't getting worse and the plants looked Ok so I sprayed them with some soluble seaweed extract and didn't see much change so I continued with the morning spraying with calmag and k with they continually looked worse and this is how they are now. I stopped spraying them with everything except neem as I usually do about 1 a week.. So in short they are now dieing and um not sure what's going on with them. I did notice some red mites walking on the soil and around base of the plant. I Doug around in the soil looking for some mites near the roots looking to see if they Re infested in the soil feeding on the plant. But I didn't see much. But that doesn't mean there not there. So am I miss diagnosing my plants . I sprayed them with need and washed them first with Dr bronners peppermint soap if there is a infection on the plant. Then again two days later I sprayed them again with neem. That's pretty uch where I'm at hoping someone can HELP PLEASE..lol