Growth stunted on a few plants for a while. Poured too much ph down water once on some plants and the leaves turned brown and growth stunted. Corrected PH to 6.8 now. Water every 2 days, Micraclegro(2 weeks ago), and nirvana plant extract(10 days ago) and nitro fert (5 days ago), i use the fert at 50% of the instructions. Some leaves of the healthier plants are turning yellow. I've realised that there were some brown spots on the leaf on the healthier plants . 60% potting mix 30% perlite 10% vermiculite PH6.8 , 7.5(before) 400W HPS humidity 35-50% Temp 28-31 Celcius
i just checked and the PH is back at 7.5. I use a few drops of PH down to 250ml water at ph 6 and watered the plants, and now its back at 7.5... how do i lower the ph properly?