If you really need to know go out and buy one of the Pin Point pH moniters or a pH pen. Pet Warehouse and That Fish Place carry them. I use the drop test kit from Aquarium Pharm. and it only goes down to 6.0. Anything lower then that I borrow my buddies pH pen and check it if I really want to know. My test kit goes from 6.0 to 7.6. good enough for me. 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. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!