Hey all... just transplanted 4 clones and started up my first grow a few days ago. 3 outta 4 are lookin good.. But the Banana Kush clone(5 weeks old) wilted almost immediately after transplanting, and the condition worsened the following days -

It came in a rockwool cube which I loosened just a bit before tucking it under soil.. and I watered it minimally with a 1/8 strength foxfarm big bloom. All leaves from the top to the bottom are sagging terribly... on the verge of looking like solid "C"'s.

Overwater? Root problem? Adjusting to light and environment? Any advice is appreciated.

Gotta 4' x 4' closet space, and i'm workin with foxfarm ocean forest soil, big bloom from foxfarm, 3 gallon pots, 400w hps bulb, decent ventilation, humidity: 40-50%, temp: steady 70-78 F, pH is 6.6-6.8.. and the soil is not saturated with water.