Yellowing of Overall plant, Possibly stunned growth- You guys think theres is something wrong with him? Full grow at profile!

My guess is your soil is too acidic (or at least out of range) and you have over watered. The fact that such a small seedling had such long roots (50 cm!) indicates to me that it was searching for food and/or water as it was not getting it from the soil. This would happen as well if your pH was out of range as the nutrients would not be available. A seedling so small in such a big pot only needs a tiny amount of water. At this size I would suggest using a Jiffy pod or similar, as it allows the plant to grow out a bit before transplanting. I had no luck with soil and I found it too much hocus-pocus to get right, so I moved to DWC. It's easier if you're ok with massive plants 😋 I would dump it and start again, it will be stunted, and starting a healthy new seed will overtake it in a couple of days anyway. The amount of money you'll spend on electricity to try and grow it won't be worth it. Check out my latest grow to see how fast cannabis plants can grow given optimal conditions (hydro and CO2 enriched).