Looks like you have not enough ventilation and not enough aeration to the roots.
I'm not so sure I'd go Hempy for a 1st time grower. Can you take the plant out of the box, get a side shot of the whole thing including pot, and describe the setup- a real hempy bucket is very specific. That looks like not very light soil and possibly a pot with a built-in catch tray- both bad for plants.