Brown leaves and roots

hello everyone, noticed the leaves and roots looking strange, any advice?

pictures below xx

conditions inside my grobo:
water temp: 20.3 c
inside temp: 26.6 c
rh: 40.7%

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Looks like nutrient discoloration
Nothing to be worried about.
Your leaves are exhibiting the same signs of intitial nutrient shock as most people on the forum. 9f it spreads let us know otherwise your good



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