You want the ph of your soil to be slightly acidic (6.3-6. so test that and then water accordingly. If your soil is 6.5 or below then 7ish water is great.
no ph down my soil always sits at about 7.2 and ive not had any problems that i know of caused by ph....however when it dropped to 6.5 my plant started having bad leaves so ph up and problem was gone