In a message dated 6/29/00 10:04:13 PM Mountain Daylight Time, joeah@webtv.net writes: > My tap water has less than 17 ppm of hardness. I have been using nylon > bags of crushed coral to gently add some hardness to the water. Is this > a good aproach? That will get it done. Very slowly.Crushed dolomite works a little faster. But most of us would die for <1º of hardness. Why are you doing it? And is that General (non-carbonate) hardness, or carbonate hardness(alkalinity)? Bob Dixon ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!