Problem with nuteburn?

Hi all.

This is my first growing.
I put the seed on soil on 6 march - 16 days ago.
Light is CFL 30 wattage ( I think I will buy one more later ), 1700lumens, 2700k
The distance between leaves and light is about 2,10 inches, sorry, I don't know how much in cm but the plant is about 9 cm tall.. Lighting: 17/7

So, back to the topic. It started 4-5 days ago. Also I haven't fed my plant, but the soil is bought from shop( so it may had some food) The second day I flushed water.. Nothing.. Seems like it's getting worser. So, today, I watered it with rainwater so the water dripped (Sorry, I don't know that word)..

So I'm now very worried what to do, maybe just let it and let the plant grow? And also does the nuteburn go on to new leaves? Like you can see on the pictures there are coming more leaves.

Just leave it now and reduce watering.

Just leave even if it get worser? Okay, that was my idea too..

Sorry about my english.

as you know you need more light, bring your light closer, your plant is long and streching. The light should be about 2 inches away. stay high

Hi again.

I'm asking about growbox walls, I can't pain them, so.. I know that Aluminium foil makes hot spots but..is it even neccesery to do something with walls which -1.) aluminium foil or 2.) Matt white paper ??

Or just let the walls so like they are ( Look the pictures above.. )

Heeey, I´ve been away for a long time, hard times actually cuz I got busted by parents and..you know, my plant is "dead" now.. actually shes living a crazy life.. hope that sunny spring comes soon.

Unfortunately I don´t know how old is she actually, but I said above when I planted it..

A picture taken today... old leafs are still there..