Looks like maybe a couple things going on.
The leaves are clawing, which often indicates to much nitrogen, and the leaves are also cupping, which can be caused by Heat, and//or to much Light, of which, most likely means it would be nice if there was a good deal more fresh air exchange, than what theyre getting now.
Outside, in nature, the CO2-PPM, is 421ppm. And the SUN, is 2100umol at its brightest. While this is my opinion, the reason plants do just fine outside, with bright sun, and what some may consider low CO2 levels, especially for up to 2100umol, is because of the constant flow of fresh CO2 via fresh air exchange. Though the overall CO2 level some may consider low. Its a never ending supply, of which all of it, will never be used.
So in my simple little brain, it seems logical, if youre in a room, especially a tent,, youre really going to either have to supply CO2, or have a really good fresh air exchange, and if you use really bright light, they wont like it. And for Co2 to really work, the enclosure needs to be 100% Sealed, or its a waste, of CO2/Money.
Not saying this is the case, but leaves are curled down/clawing, and are also cupping.
The also I would guess, they have nutrient lockout.
It also looks like they may lack Calcium, which may, or may not be caused by nutrient lockout.
I try and use the Least amount of fertilizer possible, but more than enough to keep them healthy, and never short changing them. They only need so much, and many breeders will warn you, over feeding, can cause Hermis, in some strains.
The fertilizer company should be excoriated for a 1 size fits all, at such high levels of fertilizer.
your plants look little in the pictures
