Whatsup with these leaves?

Is the light too close? I raised it up a little bit higher because this girl got taller. Her top was about 12 inches from the light (1000watt MH). There is this yellowing pattern coming through on her leaves, been watering with half strength nutrients every other watering period and sometimes just 2 plain watering periods before feeding. Just added cal mag to her diet yesterday. PH of water is about 6.5-7 The tips of her leaves are curling up slightly, not too sure what the deal is here..any ideas? Other than that she looks beautiful and bushy. I made a video today, and if youtube ever processes it I'll post it asap. I'd just hate for this to be the start of a big problem..

A few things I see:
The yellowing is a deficiency (nitrogen and/or iron).
Also the twisting tips of the leaves could be a PH issue, 6.5-7 seems a little high to me, I try to stay between 6.3-6.6.
There is minor cupping of the leaves, and the outer edges ( the serrated tips) are pointing up this could be from heat stress, what are your temps like?
I would say increase your nutes she wants more!. That will take a few days to show improvement, if you mix just your grow nute at 25% strength and foliar feed you will see results much sooner. ( never spray under your lights)
Do not get to worried about this she looks great all in all. minor tweak and she will be fine

Awesome, thanks for the advice mike. I'll make those adjustments right away and see how she fares. My temps are at the highest 75 degrees, usually between 70-75. Lights off temps are around 60-65. Appreciate the info. Another question, would you recommend sending all of them into flower at the same time? Or taking out only the little ones and leaving the BB when it comes time? I'm planning on growing her much bigger before flower and taking clones.

all depends on what you want. I like to put plants in to flower in pairs, this way i'm only trimming 2 at a time when they come out. your temps seem fine that could just be a trait of the plant. Keep me up to date on how it turns out.

I would keep the light 24" from the top , then take a temp reading at the site

I agree 12 inches sounds awful close for a 1000watts, I think the recomended distance is 24 to 36 inches for a 1000watt light. Stay medicated

Thanks Oban, light has been adjusted.

glad I can help

Looks like a ph issue from here, the way the leaves are crinkling and then twisting at the ends. Also, due to a possible lockout, they look hungry.

A good rule of thumb for light height is you want to place your hand between the light and the plants, palm down. If the sensitive skin on top of your hand can handle it, so can the plant. 12" is too close though unless you have serious a/c and an air cooled hood (and possibly a mover)