Root rot or heat stress

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Can't do that 😕 there's no more room 11 inches is the max

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Do you mean the one that can be used on humans aswell?

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I did its hydroponics system, mentioned in the comment above. Wilma System. And measured the pH yesterday. It was 5.6 but some fresh water in the tank,...

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Setup

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1m2 (40x40 inches) Mars hydro tent.

Mars Hydro TS 3000 450W LED

Mars hydro inline duct carbon filter
...

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Is this root rot? The top buds have been kinda close to the light actually very close about 6 inches (15 cm) or closer. But I have moved the light father...