I've got liquid calcium coming out of my taps, living south of the pyrenees. I'm using an RO filter with an automated CO2 system to maintain the pH at near constant levels, as I'm hooked on Amazonian fish and won't give them up. I'm in the process of trying to plant my 800litres up to try to use a more natural system of maintaining everything in equilibrium. ------------------------------------------------------------------------- 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"!