I found 19 dead floating female frogs on the surface of my pond 2 days after they laid their eggs. All of the eggs died too. I've had years of successful frog eggs to tadpole stage maturation in the past. This year I used Cutrine (in stead of just Copper Sulfate) for the first time, per label instructions and got a Cu level of 0.25 ppm (Suggested range 0.2 to 0.6 ppm). pH is running pretty alkaline at nearly 8.0.

A local pet store specializing in fish reports that Cu levels greater than 0.1 ppm can be lethal for frogs and their eggs.

I run and stone aerator, and can see a white thermometer on a string 10 feet down.

The Cutrine label says nothing about frogs. Anyone want to weigh in on this tragedy? I'll be sick if I killed my frogs!

Thanks.