Disease is the thing which every good aquarist most dreads. However hard you work to look after your tank there is always a danger that disease will appear to wound or kill your fish. However, there are a number of basic things you can do to make it less likely.
Disease organisms will always exist within your aquarium, but healthy fish are quite capable of holding them at bay. Disease outbreaks generally occur when fish are stressed.
Carefully monitoring your water quality and making sure the water is a consistent temperature will help to reduce stress, as will instituting a natural light cycle and making sure there's plenty of oxygen available for all your tank's inhabitants.
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