Well in that small of pot, The roots will consume the pot in no time. I would break the pot and use b1 solution to tranplant it in to a bigger pot . If not go to 12/12 to bloom it. It will 2-3 times in groth befor harvest. Remember dark is real dark no light what so ever.
Back off on the ferts to much leaf tip burn. Also remember to add no ferts on the last two weeks. I would clone a stick so you have more pot plant growing that is a known girl.