Discolored leaf edges and slight curling, also some stems are purple but only on the top

Are the purple stems due to strain or excess/lack of nutrients? My pH to the plant with the curling/browning leaves was low but I brought it up immediately to 5.8. growing in coco. Thanks growmies.

I also have some abnormal leaf growth

That looks like nitrogen toxicity. Clawing leaf and really dark green colour. Do you know what your runoff values are like

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