Plant health assessment (Leaf coloring and nutrition help)

Hi guys, thank you for your answers, though I am pretty positive, that you misinterpreted this time. I have only used distilled water for 2 feedings, to get the plants to use up some of the nutrition in the soil, since the last time I have given fertilizer, they got burned and I had white residue on top of the soil, indicating build up salts. The PH is right at 6.5 there is no ph problem at all anymore, yes the coloring may stem from some sort of deficiency, but molybdenum?? I'm not so sure, I have rather hard tap water, I have used biobizz calmag to some extent and my bloom fertilizer does contain molybdenum. Now with phosphorus deficiency as growing grannie said, that could be possible, because I was missing proper bloom fertilizer, the idiot who I am has bought coco fertilizer by accident thinking it was suitable for coco and NOT exclusively for coco. The npk ratios are very much different. I have since then bought the version for soil. Now, with smaller plants I might have gotten away with it, but I think the long veg phase and the size of the plants added the need for more phosphorus than stored in the plants, especially with the amount of defoliation I have done by that time. Last feeding I have added 4ml/L of npk to my water and the affected plant has loved it, the other one on the right has shown signs of overfeeding again. I think this was the last time I have fertilized the soil to finish the grow. For my next grow I will definitely keep track of all the plants individually, but for that I will have to use some sort of notepad and write things down separately for each plant. I have learned that every plant, like every child, has its own needs. Thank you for your time and consideration.