So frustrating!!!

I have these two plants one is looking like she's doing great and the other is struggling take a look and tell me what you think ! Thanks

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I would need more details but it seems like a simple solution.

What lights are you using?
What is your watering cycle?
What soil and nutes are you using?

Please provide as much information as possible when requesting help. We want to help, but we need more details than a picture to ascertain what the problem/s may be.

whats your pH?

Did you give them nutrients? I would hold off on them for a week or two and start off really light. My plants usually start to yellow when they are ready for their first nutrients. I never use as much nutes as the company tells me, there is no point for it other than to waste nutes and burn your plants. If you have to use tap water try to get something to adjust the pH levels. I have noticed using filtered 0ppm water really makes a big difference and I have not had any nutrient burns since. They look to be doing pretty decent to me other than the one spot on the left pic. I have not had as much experience as most growers on this forum though but there is my input.

I don't use anything but a ph meter in my grow so...I mix my res for my budders at 1/6 as what the fert recommends for dirt, then 5 days later it goes to the mother room. I use a drip feed on my moms. in the rock I can narrowly get by with one gallon per mom every third day. They will start to yellow if I keep this up to long. At the same time when I need them in action I'll drip them about a gallon each twice a day. The ph of the spent res water is 6-6.3ph. I do not re-ph the mix. When I hand feed with a gallon jug, I leave enough room in the jug to shake it to re airate it before I dump it on my moms. You shouldn't leave the drip on twenty-four seven. Give the plants a chance to breath. I also cut a hole in an aluminium pie plate with a slot for the plant and using a needle I perforate the bottom of the pan and the pan disperses the drip evenly around the plant instead of a constant flow on the tap roots only etc.