What have I done? Ph questions

KillsPlants

Active Member
Being a newer grower I never paid much attention to ph but I ordered a ph tester and checked my tap after a cal issue started showing up in my auto flowers and it showed a whopping 8.6. at the time this issue arouse I switched water but after checking that it's at 7.5

big thing is I'm almost sure my deficency is being caused by a bad ph balance. to top it off I'm using miracle grow 6 month and can't transplant em as they are flowering and I don't want to stunt them. What ph water should I be using
 
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