Yellowing leaves with brown tips

[Bud_Bud420]

So this is my first grow and I've got no real experience to go on. My biggest plant is showing a yellow tinge to some of her leaves with brown tips, starting from the bottom tier and progressing upwards. It is only really obvious under the led lighting, not so much in regular and the pictures I took don't show much. The plant looks ok mostly but the discoloration is progressing.

Any help is appreciated

Thanks

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