To first leaves turns white/yellowish on tips (with pics)

Hey Growworld!
Im up again needing a bit help from all your expertise!!
Ive started 2nd grow under my Hans Panel and one of my seedlings are showing a white/yellowish color on leave tips.
Ive tried reading about it, but couldnt find any appropriate info that suits my situation so i write here.
Btw, a second plants also seem to start develope the same withe tips and another has same symptoms on cotyledons.
I may have been overwatering while they were still in rockwool, but after transplantation I've only watered when they needed, and i have not feeded.
Cant be light burn, im using Hans Panel with has 1w led's and does not produce much heat.

Any thought on this?

whats your soil? any nutes in it? First soil should be light..

let um dry out real good , they are fine. no food. just water. an yes it is overwatered. she will be fine.





soil

No nutes/ferts for 2-3 weeks... for a seedling...
I'd say your soil has too much [NPK] or something and the tips are burnt because...
Seedlings need a very 'Light' type soil formulated just for seedlings, like MG Potting mix....
I mix it at 50% and add 25% perilite, and 25% vermiculite...
If you did mix a light soil mix, without added ferts/nutes, then you added a NPK mix too soon when you fed plant...
Just water until it's third or fourth set of leaves...
It'll be fine......