Thanks for taking the time to reply guys. really appreciated but tbh you've fukkin scared me now!!
i am using vita link grow a/b solution and my lights are quite a distance away in all honesty. probably about two feet. the grow table is three feet wide and nine feet long and i have 3x600 watt hps fittings along the length which i am sure is ample.
i dont feel that until i get this sorted that i can drop the heights and i certainly wasnt thinking that this problem is down to a lack of light.
i discoverd this morning that my ph pen was out of calibration!!!! so me setting ph at around 5.7 or 5.8 was in fact 5.3/5.4 is this too low anmd a possible culprit?
again, any help is really appreciated because i cant afford to fook this up. not at the price i paid for these cuttings!