No problem...You obviously know your stuff, but since the poster did not seem to know what TDS (total dissolved salts) meant or exactly what hardness was, I did not want your post to scare him away. Now this thread will help out the new and those who have been at it awhile.Sorry and happy you stepped in Dmaaaaax. Sorry that I went too far on the technical end but that was how I read the question. Happy that you expressed much the same thing in very simple if a bit simplistic terms. Depending on the person's needs, I can't say which is a better explanation for the poster.
i have never herd of the crushed coral technique. do you have any more information on itA spread like that means treating every bit of water that goes into the tank before you add it, or making only very small water changes Phil. The only consistent way that I am aware of to raise and maintain pH is to use things like crushed coral in the filter and to be very careful to always change the same amount of water on a frequent basis so that the pH does not rise too far before the next change.