ph level

what should my ph be in my homemade bubbleponic ? i just got a ph kit if anyone knows please tell me ?

I've read that 5.6 to 5.8 is perfect for Hydro grows.
I have learned that 5.6 to 6.5 will work OK.

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I'm new and agree, but I have found that 5.5 seems to work for starting roots and 5.8 is what the growing roots/plants like.