On Fri, 15 Aug 2008 17:48:06 EDT, "Pete C" wrote:

Water temp atm is 18 C. I spent time tonight looking carefully at the fish.
I can't see anything physically wrong. All my water tests are fine, except
Nitrate is alittle above normal (zero), but nothing to worry about.

That's about 64F, so there should be plenty of O2 in the water.
What's your KH?

Perhaps a temporary spike in ammonia fried them.... but I'm thinking you
might want to check their gills closely. Should be cherry red. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us