Hi Randy... I agree of course. I do use RO/right sometimes depending on the particular species. In the winter when the RO water is cold if I need to add back some hardness or even if a little hardness wouldn't hurt then I use hot tap water with something to take chlorine out of course and then mix in RO water. So I don't shock my fishies by giving them a cold shower in the middle of winter. JerryB ------------------------------------------------------------------------- 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. ------------------------------------------------------------------------- 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto