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Just tested My PH amongst other things in my 37 gallon. Was about to go purchase some fish so I figured I'd test all my water levels. It's reading at a 6.8. My tap water PH is a 7.6. I normally always test my PH after a water change and its always a 7.6 so I don't know if it drops every time to this. What can be causing this and is this harmful to my fish?