Indoor Growing Help

Hey, Ive recently adopted a plant thats no taller than 10 inches, however it has many steps of leaves that are rapidly growing out at all angles to a diameter of 8 inches. However the plant's stem is still quite thin although it is overall in good shape. It was grown firstly in the ground, now i have it in an esky filled with some potting mix, under a 150W spotlight sort of thing you would find in a backyard, in a wardrobe. I also have a fan blowing for ventilation.

At the moment the lower leaves are slowly turning yellow and drooping while the rest of the leaves are dark green and generally looking healthy. Ive read the FAQ's and it say's this is due to pottasium. Therefore do you think i should add a proper fertilizer considering i added it to potting mix from its previous medium (ground soil) and watered it with miracle grow only yesterday. BTW i removed it from the ground 2 days ago.

Sounds like transplant shock/poor lighting. IMO.

Yeah the poor thing is probably in shock. I personally would not add any other nutes at the moment just incase it is in shock.

Get some flouros or compact flouros ditch the spotlight, probably gonna make it hot and you won't get alot of good use out of it. Fan is good for making that stem strong, might even work for vent depending on the set-up. You got picks?