I always thought it was the other way around, that plants in a tank would cause your pH to go down..... at least they do in my tanks..... the pH in my planted tanks is muchhhh lower then the pH in my non planted tanks.... I cant remember, but i thought that by driving off CO2 you caused your pH to go down... Plants thrive on CO2 which is why i thought the pH in my planted tanks was lower then that of my barebottom tanks.... John ----------------------------------------------------------------------- -- 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 Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader