I use one tablespoon per quart. My prefered set-up is 1 1/2 quarts of water in a two-liter bottle with 1 1/2 tbsp of regular table salt. I used to insist on de-ionized, but that requirement appears to be another one of those rumors that somehow becomes "gospel" in this hobby. 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"!