You got drainage in there?
Looks WAY overwatered in poorly draining soil.
Add lots of drain holes.
Also a good pot is deeper than that, both to use space efficiently and to let the roots go deep.
Adding ferts when the roots are suffocating won't help. They need oxygen!
Also they are too deep in the container. Do you have something else to put them in, like a pot or even a milk jug with the bottom cut full of nice big holes and covered with duct tape?