Plants on top of plant have been this light green color at the to and bottom is still green don’t know exactly if it’s nitrogen or something else
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Sweet……
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What media are you growing in? What nutrients?
Nitrogen doesn’t generally slow at the top of the plant because it is a mobile nutrient.
But heavy light levels could show some problems with magnesium like you’re seeing.
I assume your input and runoff ph and ppm is in check?
I’m running a mailny peat based medium little coco in it and I’m using a fertilizer that’s was developed by a near by local nursery my since it’s a dry organic……. run off ppm are usually higher than maybe recommended and they were doing ok till about 2 weeks ago
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I feel maybe I had a watering issue maybe but not 100 percent sure
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If you’re running organics it’s not uncommon to see high runoff ppms.
Peat is very acidic and can make runoff ph low.
Just things to think of and keep an eye on.
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Yes I notice that ph is lower than desirable 5.5 is is where mine was around last time I did a run off test
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Add some dolomite lime to the soil, mix it in like a top dress and water it in good.
Peat gets very acidic, need some to bring it back up.
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You don’t need a lot, I would try to get ph up around 6.0.
Going back and looking at your first picture, I see some dark green leafs but no signs of nitrogen toxicity. This makes me think your ph is low which is causing micro nutrients to become more available then needed.
Dark green blueish looking leaves are usually a sign.
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Me personally, I wouldn’t mix both coco and peat together.
They are both considered soilless media but coco likes a ph down around 5.5-6.0 and peat likes 6.0-6.5… so you kind of have to meet in the middle with the two.
I think you’re gonna be really happy with your results when these are done but I think you will have a lot easier of a time if you choose one or the other.
Coco and jacks is a great combination and so is organics with soil.
Side note, make sure you’re keeping watering up, neither coco or peat like to dry out, organics doesn’t either.
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Looks like the start of a potassium deficiency and could be PH related or not enough potassium in the feed. Would also supplement some magnesium (Epsom salt) 
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So it’s a peat based media… so it pulls the ph down and as you probably know this kinda issue may be a problem only later in the grow after build up of things in media I but I looked at what you said about the line and tried that we will see what happens only the to of the plant started getting the lime green/yellowing the bottom half of the plant is still expressing good health .