I doubt that regular vinegar will be strong enough to react with carbonates unless some of the rock is ground to powder. You will only need a few drops of the stronger acids put on a tiny area of the rock to check for carbonates, not enough to really damage it. If you put the rock in a bucket of water over night the small amount of concentrated acid will be diluted to nil. Mike Wise Eric Martina wrote: > I am going to test my rocks and gravel tomorrow to see if they are causing > the buffering. I am concerned about using muriatic acid, since if I test a > specific rock and find it is not the problem I would like to put it back in > the tank. And I am worried that I won't be able to rinse all of the acid > off. Would vinegar be safer? Will it even work? Thanks! > > Eric > > ------------------------------------------------------------------------- > 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"! ------------------------------------------------------------------------- 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"!