A first-time grower at my wit’s end. Can someone please identify and advise on how to solve the problem? They are growing in miracle grow time-release potting mix under a 300 watt led full spectrum. . took someone advice and flushed them, but they still look sick 
Please help.
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Got a little miss color on the end of your leaves nutrient defiancey you can try to flush them more
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Than make sure ample amounts of water come out end of your pot than check your ph levels after that see if that makes them look better on the end of your leaves there
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Thanks a lot. So I haven’t ruined my crop. They are in their 3rd week of growth and trying to make it through this quarantine unscathed. This is my first grow, and I have learned a lot, like not using miracle grow time-release nutes potting mix. Never again. Coco from here. Thanks for taking the time, my friend. Stay safe.
You are nuking your plant with nutes and submarining your pH every time you water. What you have is the start of nute burn. Transplant it (them) into a more cannabis freindly soil such as Roots Organics, Black Magic, or a Fox Farm product.
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I see early signs of nute burn. Overall nice looking plants.
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I’m unable to replant at this time but I am wondering, can I add just a little hydrogen peroxide to aerate the soil so the roots can breathe, or is that too much?
You really need to get it out of the Miracle Grow. Miracle Grow and cannabis don’t get along. There’s not a whole lot you can otherwise do to help it.
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I agree wit @MidwestGuy, I have had some successes with MG but, far more failures, even outdoors 
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