I'll just share what has been shared freely with me
The humidity can be upped, and the plants would like it better. J Trich, our Seedsman rep, taught me that I can put an amount of water in the tent, like in a tub, then use say a towel or rag as a wick, to increase surface area for evaporation to occur, and the plants like it better. I don't think it is septoria because the blotchy pattern is different, it is a fungus that happen in warm, wet areas. What you have there is warm and dry, so less likely for septoria.
I would feed the Black Magic one with just water, then when the leaves start to pale you introduce nutes. I use Black Magic liquid and I find it pretty hot, as in, can burn the plants.
Hard to say anything about your other plants and biobizz soil as I have had no experience with them.
That tall stretchy one may be too far gone to be saved, but other people may have other suggestions.
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