Ammonia test kit
A must for all pond owners.
Ammonia is released constantly by fish as a waste chemical.
In an established fishpond, ammonia is removed as it is produced, by the good bacteria in the filtration system.
However, at times, this balance can become out of whack, which can raise ammonia levels.
In this case, action must be taken, such as water changes, adding of "Ammonia Remover", at least 7 days of no feeding and daily checks of ammonia.
For more details, see "helpful tips" section above.