Hey Ganja
Sorry it took me so long to get here. It takes all of us to help each other, there are far to many for most of us to handle. I do my best to help where I can.
Anyway I am on board with you if you don't mind my commnetary.
First up I would mention two things that jump out at me.
1. The black plastic needs to go. It absorbs heat into the medium you don't need. Use white.
2. It appears you are suffering deficiencies. I may be all wet, I miss occassionally. Here are my thoughts, calcium is most apparent to me. It is the also affecting the uptake of other nutrients. It explains the drying out and death of your fan leaves. It also is apparent to me in your weak distorted foliage/growth.
This could be caused by too much Nitrogen and Phosphorous, locking out the calcium. I will venture a guess yours is due to the medium's lacking and perhaps your water. Solution would be Cal Mag Plus. If its lockout then a flush is in order.
You want easy?
Sprinkle some OC+ in a good soil, then just water and watch it grow.
Calcium is another important element that helps the plants cell walls, cell division in making the plants stems, stalks, branches stronger, as well as contributing to root growth, mostly the newer root hairs, Calcium also helps enhancing the uptake of K in the the plants roots. Calcium moves really slow within the plant and tends to concentrate in roots and older growth.
When plants exhibit a Calcium deficiency the younger leaves are the first to show it as well as older leaves. The Leaf tips will die back, the tips may curl, and growth of the plant is stunted. The plant can show a weakness in the stems and branches, as well as a under developed root system that can lead to bacteria problems with roots dieing off. Having slow plant transpiration rates can aggravate the uptake of calcium. Make sure your soil isn't very acidic, for calcium gets harder to be absorbed through acidic soils, Which leads to having a plant that is deficient in Calcium. The leaf tips, edges and new growth will or may turn a yellow/brown colour that happen in spots and often surrounded by a sharp brown outlined edge and then the leaf tips die back. If too much calcium is given at an early stage of growth it can stunt the growth of your plants. Having to much of calcium will also flocculate when a concentrated form is combined with potassium. The parts affected by a calcium deficiency are the roots. Stem or petiole, young or old leaves.
Too much Calcium will lead to other micronutrient deficiencies. Calcium fixation is caused by many types of mediums such as: clay soils, unbuffered coco and humus. The lime tends to bond to these soils very easily. The stems of the plant will not be able to hold the plant up and will exhibit a white brown in between the veins of the leaves when having too much calcium. Also having to much potassium and or nitrogen will cause a calcium lockout.
More info @ the Plant and Pest problem solver link in my sig.
For reference: Availability of elements relative to ph. Be sure to use the one that matches your grow. Hydro or Soil