Happy and healthy fish add extra life, colour, interest and movement to the pond.
In a well balanced and properly maintained pool, fish diseases are uncommon. If a fish health problem does occur it may only be noticed at an advanced stage. Prompt action will help avoid the issue becoming more severe.
Take a little time when looking at your pond, or feeding fish, to become accustomed to the typical behaviour of your fish. This is very useful, as you will then be more aware of any unusual behaviour, and rapidly alerted to any possible problems.