Yellowing in between veins upper leaves

need to know what you've been feeding to help deduce what it is. usually more than one option, even if one is more common. Check the lables.. what % Ca? add it up.. calculate ppm.. is it low? then, you can safely add it. don't just add "stuff" to fix "something".. be certain first, or it iwll get worse. usually it is too much of something or an imbalance. most people feed too much at the beginning. it's one of the smallest parts when things go well, but if we screw up it's a big negative to yield. your lights and environmental variables are nearly everything. Hard to tell with those pics too. Like my lights and many others, yours don't help in this context alone.

The plants are much taller then I expected forsure their only like a foot away from the light I see that in my nutrients they don’t have any mag or calcium could this be issue leaves are curling up kinda taco like in some areas will plant be ok w heat issues this soon into flower rest of plant is super perky and frosty and one plant doesn’t have any issues at all but is different strain

How far away are your lights? saw your diary that you dialed up your lights.. since it's only on the top it sounds like they might be getting some light burn / heat stress issues.. Hope this helps..