Ok so I got some clones about a week ago and everything was going well until I woke up this morning, 2 out of the 6 plants growing are experiencing wilting leaves and the top of one the plants is starting to bend over, i'm still pretty new to the hydro but my ph. is sitting between 6 and 6.5, have the correct amount of nutrients and plenty of light to go with it. My setup is a box system with the 6 plants coming in from the top, the water sitting in the bottom and a pvc pipe running between the 6 plants using 5 sprinkler heads to spray water on the roots. I was not using the bubble disc to create oxygen bubbles in the reservoir but added it around an hour ago with no noticeable changes so far. I'm a newb and know it but am looking for any type of advice I could get, Thanks!