Thanks to all for their helpful advice!
The pond is stabilized and all chemistry that I am prepared to measure is looking good. I just received the Pinpoint DO meter and am reading to make sure I do the tests right and then will know my DO value. Plants doing well, fish happy acting- no more deaths, and my only hard environmental concern would be temperature. The temp will at times get to 30 degrees C but not very often-I add cool water by hose when I see this. My next large project will be the gas heater for the winter- any good priced items you guys know about?
