So angry ! 6 weeks old plant looking like this ! Help !

And get a aeraiter, like the ones they sell to keep bait fish alive or for aquariums. I airate my water and or water/nute solution for about an hour before watering.

I would water less heavily, and cut nutrients in half for now until i saw some progress. You should be watering lightly in that big pot.

It is better to use smaller pots for smaller plants for nice root formation and so the plant can suck
up the water it needs and the air it needs instead of sitting in a big pot of wet soil for too long.