Most likely not. Only if you plan on doing massive water changes would I be concerned. An established tank may have more acidic water than the water you are using for a water change. If you have been doing regular partial water changes then it may not be such an issue. The judicious use of CO2 also will not greatly impact the pH. Eric --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html --- ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/