There is probably nothing wrong with them at all then.

Based upon your description and over all setup, just sounds like business as normal. Some plants grow faster than others....the HPS doesnt help but it sounds like you need to let them just get growing at their own rate....

The leafs turning green to the tips is a sign of the wrong light spectrum but it will adjust and be fine.

Keep updates

Thanks
HARDDON Reviewed by HARDDON on . My plants must be stoned...... Alrite I have a 600w HPS on 12 plants and none of them seem to be makin progress, I know the light isnt too far away from the plants because there is no strachin....just wonderin if there are any others factors that could be afectin slow grow Cheers... Rating: 5