you have to get rid of the algae. the big problem is going to come when the water is
warm and the sun goes down it will suck ALL THE OXYGEN out of the pond and by morning
your fish will be gasping if not floating. the bigger ones die first. Ingrid

On Mon, 26 May 2008 11:06:00 EDT, Joan wrote:

I think the pH gets a little higher on sunny days. There's no
concrete in my pond. I don't know what's driven up my pH overall,
but I think that the big afternoon spikes are due to algae. KH stays
pretty constant.