Indoor Curling, wrinkling, and brownish spots

[Marco Polo]

-Problem: Hello, I germinated this seed last Tuesday and planted it on Thurdsay, for some reason that I don't know about it seems like the small right fan leave is being "eaten" away, there's a bit of white on the sides and the first set of leaves seem to curl up and I noticed today that it's beginning to wrinkle with this brownish spots.
-Medium/grow method: Johnny Green Soil.
-Feed and supplements used: Decent jet sprays of RO water every 3-4 hours around the stem as it dries quickly due to the fact that I'm using a 19 liter pot which serves as the first and the last home.
-Water source: RO water, TDS is about 20 ppm
-Strain and age: Mandarin Haze from Ministry of Cannabis, Age: about 4 days in soil.
-Climate: About 77F during daytime and 74F during lights out. RH is kept at the range of 61%-67% using a monitor alongside a humidifier and dehumidifier. I recently put a few small holes in a plastic cup using a needle and placed it as a dome above the seedling.
- Light used: LED 300w (P300 from PlatinumLed) Veg switch only Kept at 36 Inches from the soil, Light Cycle is at 20/4
-Additional info: The plant suffered from "Helmet Head" for 2 days and then the problem somehow solved itself which means I didn't interfere.

I tried to upload the photos and would always get: Security error occurred. Please press back, refresh the page, and try again.

https://ibb.co/Yhzwj5v
https://ibb.co/mNHtkGg
https://ibb.co/Xt55Jy2
https://ibb.co/vPGBHSx
https://ibb.co/KwH9SBz

Links to ImgBB, free image hosting

 

[karlkutta]

I think looks fine but let's see what the other guys think

 

[Marco Polo]

Reassuring as I'm really concerned... Thanks pal.

 

[namvet25]

Do not over water at this point and keep fresh air moving gently across seedling.What is in that soil?

 

[Marco Polo]

There is a clipped fan that is always on, pointed slightly above the plastic cup "dome" that I made. there's basically some wood chips and organic things as I've noticed. Is there some sort of a rule of thumb, to tell when to water and when not to?

 

[karlkutta]

I would water when it's getting dry, only around the seedling and not getting the entire pot soaked. I think regarding the soil the question was what kind of soil you have, mixed with anything, etc

 

[Marco Polo]

Yeah, It's mixed with Wood chips and roots of other plants I reckon. Organic stuff basically.