my 4 month old Lychee seedling needs help!

I started growing the Lychee tree in regular soil, and after about 2 months i desided that i wanted to try to grow it hydroponically.

Ever since its first leaves, the tips of the leaves are turning slowly brown and crispy. It grows under a growing light at room temperature. New leaves are coming and it seem to be having it great except for the leaves turning brown.

I included some pictures for you to look at. Please help me! I really love my plant and dont want to lose it! And it seems that the leaves are also turning a lighter shade of green almost yellow-ish color. What does it mean!!?? :O

Here is a look at the plant

And here you can see what i am talking about

  • This looks like nutrient burn. How much nitrogen is it getting? – jbcreix Jun 19 '17 at 0:13
  • Possibly potassium deficiency. What are you using for fertilizer? What is the formulation? Could also be chlorine and fluoride in tap water. Are you using city water? Doesn't look bad at all. Your plant is just trying to tell you what it needs before it does become a problem. How long have you been doing hydroponics? – stormy Jun 19 '17 at 17:34
  • Is it in flowing water or still water? Do you oxygenate the water? Are the roots ok? – Alina Sep 10 '17 at 14:35
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    @Alina judging by the background, this is the hydroponics set "Växer" from IKEA and this has still water without any pump mechanism. – Stephie Sep 10 '17 at 18:59
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    Then I guess it's root asphyxiation. When the roots stay in water they are deprived of oxygen and they die. The symptoms are browning and falling of the leaves, starting at the tip. This is why in hydroponics you have to provide aeration to the roots. – Alina Sep 11 '17 at 8:53

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