Well right on schedule, within two hours the fish is just about dead.
Something new that I have noticed is that the auto-refill appears to
never shut off. My LAST POSSIBLE explanation is that the auto-refill
continues to allow chlorinated water to flow into the pond which kills
the fish within a couple of hours. This last time, I am going to
empty the pond, and refill it partially and then turn the auto-refill
system off.