spiff;1492027; said:oh yeah.. i am able to adjust PH okay the way it is.... It takes about 3 tbls of PH down (acid) to change PH one point in my 140... that doesn't seem like too much chem for the volume, does it?
Test your kH. It may temporarily change it but do you know how long it stays down before it bounces back? If you have a lot of buffering it will go back up again overnight or within a couple of days which is really bad for the fish. If you have so little buffering that pH down is consistently dropping your pH that's almost worse because it means you won't be able to reliably keep your pH stable, it could drop off the charts.
RO (reverse osmosis) water is filtered so that it's essentially pure. It doesn't contain any buffering, minerals or chemicals like chlorine and the TDS is at 0 or around there depending on the efficiency of the unit. With RO you have to add buffering back in so your pH doesn't fluctuate in your aquarium. You can either use something like RO right which is a powder that you add a certain amount of to get the desired hardness/pH and rebuffer, or you can mix with tapwater or waste water in the right ratio until you get it where you want it.