Brown Spots / Tip of the leave - help me diagnose. Pics!!

Hi Everyone,

I am using a hydroponic system, I am on day 19 (from seed), and the last few days I notice some brown spots on the tip of the leaves.

In the very beginnig I made a big mistake, the nutirent solution was too high (almos 1000), but I change it to around 250.

My journal is: https://www.rollitup.org/grow-journals/479964-fist-grow-journal-superbox-cfl.html#post6592624

Pleas help me diagnose this:

Pics:

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brown tips are usually caused if you overfertilized ( which we all do sometimes lol ) .. im not sure how much ferts your using at the moment, but cut them back to 1/4 and go up from there ...

happy growin