Help Yellowing in the veins of my 4 week old blackjack from nirvana

Can anyone help me identify this yellowing in the veins of the new top growth of this blackjack plant from nirvana that is 4 weeks into veg growing in soil,3g pot, with a ph of 6.8,only the top is being affected,thanks in advance
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any suggestions or solutions riu family ?

looks like a deficiency. wut soil is it in, wut r the nutes u r giving, how often n how much do u feed, how often do u water, how strong is your light source?

foxfarm soil,entire line of ff nutes,rite now using grow big & big bloom feed with every other watering,water once a week, 400mh 18inch above tops of plants

sounds like she is getting her nutes. once a week watering sounds like its not enough, how dry does the soil get? i dont think underwatering would cause that. i water my potted ones every other day n feed once a week. though it all depends on the environment n how fast she is growing. it still looks like a def to me

shes growing real good but stays wet longer than normal,all most 2 weeks before soil dries out

could b not enough drainage. wut u see on the leaves could b signs of a problem in the roots. if they r too wet or too dry it can cause problems. thats all i can say from the pics n info