@auto noob,some of my plants have got reddish stems through the leaves,but no yellowing leaves.ive always put the reddish colour down to low temps or the fan blowing a bit too much cool air over them when lights off.
Phosphorous deficiency,by the look of it.if your leaves are yellowing.but if you have red stems and leaves look fine,there shouldn't be anything to worry about.you need to adjust your PH @auto noob.
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