All the plants issues stems from killing it with too many nutrients and it's normal for noobs to do so.
In your posts you were always talking about nutrient deficiency and wanting to add more nutrients including three types of nutrients without mention of adding microbes for example.
Remember there is no such thing as "nutrient deficiency or pH lock out" the truth is the roots were burnt with too many nutrients and what looks like a nutrient deficiency or pH lock out is really the burnt roots inability to pick up nutrients and Magnesium being the first show up.
Just chuck it all in the learning bin and try to finish what you have, get microbes and stop over feeding.
BTW: good job on not over watering and not killing them with too much light !