I agree with Mike Walter for the 'Black water' species you will be using straight RO with some peat or black water typ extract. To give you an example I add about 3 gallons of tap water ( pH 8.3 500 us/cm) to my RO/DI water that is pH 5 and < 5 us/cm. This gives me water that is stable pH 6.5 and around 30 us/cm. The point I am making is you probably dont want to use very much of your well water at all. But of course it just depends on what water parameters you are looking for. Hope this helps you out a bit. Good luck. ===== David Sanchez Orlando, FL http://www.mindspring.com/~barbax barbax@mindspring.com __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------------------------------------------------------------------------- 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"!