if you can get mh bulbs for the veg stage your plants will be less stringy , there is not much blues spec in hps , good for flower but not so good in veg , you can also get dual spec hps with blue and reds , the more blue the better photosynthesis, you will have more green leaves and more busy plants with thicker stemsAs a summary to this thread. I will now add a half dose of calmag, carry on top feeding for another week, 2L every 2 days and hit them will 1200w hps power. Thanks for the advice guys. I shall make updates with their recovery(I hope!). Anymore input is welcome!