HI I need somebody's assistance , with co2 as bubbles per min please. My tank is 400l has a PH of 8.0 ,kh of 6deg , would like some were to start from but do not want the PH to drop to far say 7.0 or 7.2 thanking you Dean (outback OZ) --- StripMime Report -- processed MIME parts --- multipart/alternative text/html ---