hi mate,
right lets look at these pics,
ill start with pic 1, i see 1 or maybe 2 problems that need putting right before we can look at anything else like ph etc etc,
so this is what i see,
1, you see the leaves that are cupping up at the edges, well the plants does this when its to hot, it cups up so it can lose more moisture when the wind blows on it, so you either need to use fans to get the temps down a bit or raise the light a few inches and see how the plant looks 24 hours later, the only other thing that can cause this is if you have a fan blowing directly on the plant to strong but to me it certainly looks like heat stress, when the plant is heat stressed it stretches which if these plants where outdoors is not a problem, the plants stretch so they can get taller and reach cooler air or at least catch some of the breeze, indoors the plants stretch an just get into warmer air so the problem just gets worse,
so you either need to try and lower the temps using fans or you need to raise the light a few inches, if the grow room is to hot then try leaving the door open a few inches when the lights are on, my door is open 6 to 8 inches when the lights are on as temps get to high as i dont have vents due to the space im growing in, so i leave the door open, i have 2 x 12v computer fans inside the room moving air over the plant, 12v fans are not harsh on the plants but move enough air to gently shake the tops of the plants, outside the door i have a desk fan sitting on a chair and i turn this on for an hour or 2 at least 2 times a day, its not on all the time but i turn it on for 2 hours then off then back on later on in the day as this helps strengthen the stem,
now for problem 2, this might not be a problem as it could all be heat stress related, its not in flower or showing sex yet by the looks of it, but it looks to me like its either over watered and thats what causes the wrinkled leaves, it also looks a light green which again suggests its over watered and the roots are not getting as much oxygen as they need, when this happens roots die and the plant wilts as it cant take in the water and nutrients it needed, so keep an eye on how often you water and see how heavy the pot is, the plants like plenty of oxygen at the roots so i only water my plants every 7 plus days depending on temps, growth drastically slows when you over water, ive had this problem a few times when i first started growing, i couldnt work out why they wasnt growing and then i found out i was over watering and the plant could not take in the oxygen it needed,
so check the temps, if you have a temp guage then try and hold it at the same hight as the top of the plant and leave it their for a few minutes then check the temps, check how often you water and check the drain holes in the pot if you can and make sure their not clogged up, then just let the pot dry out before you water next, when the pots a bit dry the plant does suffer with heat problems if the temps are a tad to high, so your problem could just be down to temps or temps and over watering,
if its not over watered and it is left to dry out then are you feeding any nutrients yet, if the leaves are starting to look a light green colour then this is usually because its overwated and its not taking in the nutrients and water it needs, or its a lighter green as its used up all the nutrients and it now needs feeding,
so let us know how often your watering and how often your feeding nutrients, i dont think you have a major problem and it should sort itself out in a day or 2 as long as temps are kept in check and your not over watering,
if you have any more problems or it gets much worse then post another pic and explain whats going on, but at this stage the comments about heat being the problem is pretty much spot on, ph problems can also cause cupping or curling but it looks slightly less like cupping where as yours looks exactly like its cuppling,
pm me again if you need to get hold of me a bit quicker or feel free to post a help request in my journal and im sure someone will come over and offer advice if im not on here,
It's 4:30-ish a.m. and a massive round of thunderstorms has me up and awake. I do love a good thunderstorm...but the last couple of years they've been damaging. So hopefully when daylight comes I won't see any trees down. LOL
Just touch the plant and get a reading of it's body temp. LOL
The problem plant doesn't have any other signs, other than the wrinkled/cupped leaves which has been there since it broke ground. All of the other plants recovered from the over watering while seedlings and the root bound issue from the cups being too small, except this one which displayed much different symptoms and stayed that way.
