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A water company report may show it. When I first started out I never tested water at all. Fish mostly did fine, etc, etc. I think it would be useful to have it tested (maybe a fish shop will test or know) so that you have an idea what it is.
I do think I have better control over the tank testing every so often and here we have soft water which for some reason can get very soft over summer.
once the windows open up the ph should go up on its own , tanks with glass covers the ph would read low , tanks with breathing covers the ph will be higher ,
in the winter my ph is low , but in the summer once the windows open it goes up ,