"Quercus Robur" wrote in message
...
I have a very small pond, about 120gal and small water fall. We live in N.
Illinois. 4 Koi, 3 Schubunkins in pond. They always swim aound, even in
winter, and beg for food. I use a floating water heater and all have now
survived three winters OK. The heater is now out of the pond. Ten days ago we
had a cold snap, down to 25oF. The pond did not freeze, but the fish went into
hiding and have not come out from under a stone shelf. This is abnormal
behaviour. I changed 60% of the water adding chlorine and chloramine remover.
Still no movement. Is this normal? What should I do?

Thanks,
Martin

What is the temprature and pH of the water?