Get power to that pond as soon as possible or get bubbles into the water or you stand the chance of losing more than your temper. This has happened to us. We ran lines from a neighbor's house. Luckily we were the only house affected. If so - Increase aeration.
Chemicals steal oxygen too.
It's always a good idea to increase aeration if you're not sure. The sign to watch for is your fish gasping for air. These are topic pages with links to information and product. Copyright 2000 by The Pond Doc . All rights reserved.