Leaves stretch vertically

looks mostly ok to me. I do see that the little serrated edges on the leaves are also pointing up as well. I think this means its a bit to much of something, heat or RH if I can recall. Maybe watering issues. I don't think the way the over all leaf is growing is weird seems on par to me, but the edges pointing is a early sign.

Hey there! From the looks of it your plants are very healthy and happy. A "lack of nutrients" would present differently in the shape of leaves changing color, curling up/down, etc. Idk about the heat stress. You provided no information, so I can't really asses this theory. Also, you seem to have a good quality light and it's not too far away for such vertical growth. Another theory I have is that due to the limited space in your growing environment and the plethora of plants, they "fight" to absorb as much light as possible. In short, they try to maximize the amount of light absorbed by stretching over one another. Obviously this creates competition between plants and reduces overall yield, because they're more focused on beating each other to the light. If it's possible, I would think about defoliating so that the light penetrates much deeper into the plant and reduce the "need" to get closer to the light. For your next grow, think about lowering the amount of plants. I know it's awesome to look at the SOG (Sea Of Green), but the overall yield will decrease that way.

Usually what we see can be caused by more than 1 thing, so i wouldn't doubt more than 1 thing can cause this too. If giving too little light, the leaf will stretch to get more. A little bit of praying is usually considered a good thing, but if exaggerated, i'd lean toward giving a bit more light. Apply some common sense to elimiinate it as a possiblity.. if giving plenty of DLI, probably not this. the leaves left of center and abit on bottom half of 2nd picture looks like it might have the beginning of interveinal chlorosis, but could also be an illusion of the camera + grow lights. if the color is smooth across the leaf surface, it's just an optical illusion. Some times a leaf flush with water is a bit rippled and you get different color due to curved surface. You plant is probably lusher than it looks under grow lights too, so i doubt it is lacking nutes. I think it's reaching for light due to a little crowding of colas.