On Thu, 26 Aug 2004 20:50:08 +0100, "SkyCatcher" wrote:

The pH is 8.5 - reading taken at 2pm & 6pm. It used to be OK & the tap water
is 7.

If your tap water is 7.0, I'd go the KISS method and just do water change
outs. 10% every day for 4 times and I bet your pH is down to 8.0 a more
plant happy pH. Plus, this won't shock your fish, doesn't cost a lot nor
any hazardous materials training needed. ;o) Then do 10% change outs
weekly.

It would be helpful to know what your total alkalinity (KH test) is of both
pond and tap water. As you may still need the Baking Soda. ~ jan
~Power to the Porg, Flow On!~