Indoor grand daddy purple auto. 330w at 33% power at 14 inches. Coco w/ 20% castings. I feed at 5.5 PH and light on the nutes. Just started some cal mag too. Any help on why the leaf is yellowing between the veins? It’s become more and more noticeable.
Welcome to the community @Clowndog531 , your plant looks little young to be giving nuits, try letting out dry out, ease back on the watering, pH around 6.2.6.8 and only water when you feel the weight of your pot and you’ll notice when she needs feeding, more guys her more knowledgeable than me, here is @canagen @SoulOurGarden , I’m sure these guys will have great advice, happy growing 
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Welcome @Clowndog531. Your plant has a mild case of magnesium deficiency. Feed either calmag or if no calmag, you can use Epsom Salts @ 1/4 teaspoon per gallon and use that in your next watering.
@Deanroche is right though. Your ph could be higher as well.
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Agreed with the other 2 guys here. Also allow the coco to dry right out between watering
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