just like RED said, why you want change your ph? what is your tap water ph?
it is better to have stabil ph than deal w/ all the chemical or even it is natural stuff, especially if you have large tank or mutiple tanks. you'll get headache sooner or later, believe me.
I know some people breed their discus in high ph 7.6 Mine is 7.6-7.4 and they're still doing just fine.
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