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mix ro water with your tap water. what fish are you trying to support with the lower ph? i have rams and other dwarf cichlids that i lower my ph for. you will need to experiment until you find the correct mix. i use about 25% ro water to 75% tap. that gives me a ph of about 6.8.
Stable pH that doesn't fluctuate is far more important than the specific number.
Generally, if the pH is stable, most fishkeepers don't need to mess with it, and trying to change pH can lead to fluctuations that do more harm than good.
If you could give the forum an idea of what kind of fish you have, that might also help as some fish are far more tolerant of high pH than others.
I don't think any of those fish are particularly picky when it comes to pH. Were it me, I'd leave the pH alone. So long as it's stable, you should be just fine.
I have a beta and platys in 8.5. They are fine, just keep an eye on your water and make sure it isn't jumping up and down.
an odd question but are you in an area of the US that was hit be those nasty storms friday and saturday?
We have had some odd fluctuations from the treatment plants going off line and getting them back up and running.
Had you area suffered allot of power outages?
We are still having problems around my area. Or water was turned off least night and was off most of the day today for repairs to the water treatment plant caused by power outages.