wondering about RO water and pH
So I've been thinking of using RO water because my tap water is pretty freakin' toxic especially for a shrimp tank. However, after running some water tests, I found that in addition to having 1.0 ppm of ammonia (yikes) the tap water that I've been using also has a pH of about 8.4. The water in my tank is about 7.5.
I'm guessing that the piece of driftwood and the soil substrate I'm using helped lower the tap water's pH to this level, and I wouldn't be surprised if they kept things in balance. So, I'm kind of concerned... RO water's pH is the same as my tank's, 7.5. If I use it, will the pH drop? Or will it not really matter?