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@Dewdrink73, I have never grown Zkittlez unfortunately, From the fast buds catalogue I have only grown the LSD-25, Blackberry, Mexican Airlines, C4, Crystal Meth, Six Shooter, G14, Tangiematic and Blue dreamatic all yeild around 3oz plus in 15l fabric pots under 550w True LED watts and fed Organically PHd in the 6.2-6.8 range.
@Mrs_Larimar, I definitely wouldn't recommend trying to keep your PH in that range. With hydroponics you want to be in between 5.5-5.7 NO HIGHER NO LOWER as this will effect the uptake of the nutrients and slow the growth of your babies. Also @Stick is dead on, you need to raise the temp of your nutrient/water by 3-4 as 20°C is perfect for hydro media. Good luck with finishing the job :)