Aqua Man
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This is not true. Very early potassium and phosphorus will show dark green leaves before the start showing other symptoms.First sign of deficiencies will be light green yellow leaves, it needs to be repotted into a bigger pot and be given only water for 2 weeks.
It is nutrient burn causing nutrient lockout.
Nutrient burn causing nutrient lockout? Are your talking about the roots. Are you talking due to sodium buildup or nitrogen toxicity? Nutrient burn is typically referred to as nitrogen toxicity in my experience.