PLEASE HELP. auto plant having infinite problems.,

I have an auto #1 plant that started getting yellow tips. so I stopped all nutes thinking I was burning them. but the problem progressed and got way worse, now the plant just looks like a lost cause. its in flowering but progress is at a slow creep, my auto purple that started at the same time looks weeks more advanced. not sure what I should do, im not an auto pro by any means, wondering if its a lost cause. please any advice is welcome. any questions about the set up just ask or pm me. thanks

What's your pH?

-spek

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Those pictures are awful small, really can't get a good look at the foliage. What were you giving them before you stopped?

Where did the symptoms start: lower growth, newer growth, middle?

I didn't ph the water, bad I know, but I have never had problems with my tap.

I was giving them fox farm trio for soil, it seemed to start at the top.