It looks absolutly soaked. And you also need to get it into a real growing container that has holes for drainage. I also agree with Houston...them roots need to be in the dark
What lights are you using? That plant really does not look too good.
i dont know about the best soil, because everyone has different opinions.
i like bx pro-mix or sunshine mix.
something with moisture control and drains well.
you really do not want anything with slow release fertilizer that will feed for 3 months. you want control of what nutes and how much is given.