What ph do i keep it at?

hey all, I have 2 waterfarmas im about to plant in, i washed the hydrotron and the soaked the rockwool and germinated teh seeds, ive read that with drip systems like the waterfarm most people hand watered for the first week or so? idk, and i know that the water has to be at a certain ph for plants to absorb nutes, what ph is that? Thanks

5.2 to 6.5. And any where inbetween is alright.