THanks dave, I use about 1/8 (up to 1/4) of a teaspoon of calcium bicarbonate added after I change the water. Do you think that is okay?? Kathy On Wed, 10 Oct 2001, Sanford, Dave LHS-STAFF wrote: > Hey, sorry i couldn't make it to the meeting. > I don't think that bicarbonates are the best way to "harden" water for live > bearers. That can and probably will lead to pH swings. I would suggest > adding a handful of crushed coral, or 1/2 strength Malawi salts. > dave >