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Plants leaf tips are browning and the stem of fans are purple red
L8trnickstarted grow question 9 hours ago
Fc4800 @ 75 percent 20-4
18 in from plant top
Week 7.5 from seed
Been water every 2 days almost a gallon of filtered ph 6.25 water
Feeding 2 tbsp of royal gold bloom every week
The leaves are starting to look burnt at the tips and one is really short curious of any opinion
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001100010010011110answered grow question an hour ago
purple stems - if it's only in areas of intense light, it's common under LED. Nothing can stop it.
It 'can' be a sign of low p, but unlikely the case. Especially when you are giving more DLI than necessary with the FC4800 as i suggested in previous answer.
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001100010010011110answered grow question 8 hours ago
I think your light is too strong. Even if it took a while to see symptoms.
Without supplemental co2, you're better off with ~65-70% power, 18" and 18 hour cycle.
if your heart is set on 20 hours, reduce proportionally. ~55% for 20 hour operation.
Also possible that your 2tbsp/week is not fully supplementing the soil, but this looks to be localized to the tallest parts of plants and not the short one much at all, plus personal familiarity with the fc4800. Being this little off might take weeks to see a symptom caused by it.
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