If something does get into the pond you should do at least a 25% Water change as soon as possible to dilute the toxins. Make sure to use your dechlorinator and add in some salt into the pond 1lb per 100gallons of water
***Very Important use Feed Salt or Rock Salt (do not use table salt or water softener salt..these have iodine and other things in them that hurt the fish as well)****
Whenever your fish seem under the weather make sure to do a water test, (we do free water test here and most pet stores offer water testing as well). Check for Ammonia, Nitrites, and pH. pH in this area runs high so a reading of 7.5 or 8 is normal.
If you have any of those issues give us a call and we will talk you through what to do to balance out your water.