Hi all, Thanks for all the information about the removal of lime deposits. I went to the store and purchased a gallon of white vinegar and 3M Scotch-Brite heavy duty scour pads. I don't know if I made a mistake with these since it recommends not to use on glassware. We'll see how they do. I'll try the oldest tank first. I will be doing empty tanks. I guess that vinegar or acid would drop the pH pretty quick if put in a tank which was set-up. Jerry F. Kasey kaseyjms@worldnet.att.net ------------------------------------------------------------------------- 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"!