Is vinegar ok as an acid or is there a better way to go? I'm not sure I need much, between the ro water and wood in thetanks I can get the ph close to 6.0. TIA bb ------------------------------------------------------------------------- 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"!