Why is she so light on top

color is not perfect yet, but she has gotten better and a little more consistent. These answers were all very helpful and very much appreciated. great community and great peeps! wish i could share the love and mark multiple answers. steps taken include: working towards managing ph. not there yet , but working on it more airflow from fans to get things stimulated keeping lights at between 18 and 20 inches watering when gets pretty dry - every 2 or three days adding cal mag with most waters, but not all adding grow big nutes just a couple of times. trying to improve/increase heat a little to get from 60s and lower to high 60s and higher thanks all!

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forgot to mention that i also moved the little usb fans ( 2 per tent ) so that they hit the ladys more often. will be posting pics this evening. working on getting stuff needed to maintain the ph.

Thanks everybody for the comments and suggestions! she is looking better today after adding the calmag yesterday and bumping the temp from around 57 to around 69. I used an uncalibrated cheap ph meter to test my acclimated tap water and saw that it is reading only 5.9 ... so prob need to bump that up. how much vinager would i add to roughly 4 gallons of water (which is whats left in the bucket of available water right now )?

Are you sure your pH is right, I doubt they would go so hungry so early... Good watering regime is strick base that you have to follow. I haven't grow anything in that line of FoxFarm, but ussually theirs soil is rich enough not to show such tricks ... Good regime dry/wet/dry and good pH. I see you made your steps with CalMag, don't overdose it too. If she will start to recover and drink regularly - have nutes near you and start slowly feed her. I hope your lights are not burning them, because that pattern goes from first week. Some lights can burn calcium like crazy. I am blasting mines now and they look bad, but I can lift it up ... Just maintain as healthy as I can ... All the Best !

@LearnForgetRepeat hey mate the plant is very very hungry for nutrients but before going and feeding it you must check that the PH is within the optimum range for ya soil which is 6-6.8 I personally like mine around 6.4 or 6.5 if the PH is good then your soil is definitely lacking NPK mostly nitrogen by the looks

@ezzjaybruh is right.