GMSgrowsanswered grow question 4 years ago 400 ppm 0.8 ec is there starting point from seedling. 500 is ok once the reach a week old.. Have you calibrated your ph and ec meter lately? Plants that do that usually have ph off some. Make sure your rockwool isnt touching the water as well. Keep it just below and let the bubbles keep it moist. Keep your water as cool as you can, if your not using a chiller then frozen watermbottles in the rez. Cut the diamond nectar out of the equation for now.. I grow soiless so if you want to have a peak at the feed regiment I use, same for hydroponics, your more than welcome to check out my Gelato fast flower diary. Cheers