New fish can sometimes introduce diseases to aquaria, and these can be difficult to diagnose and treat. Most fish diseases are also aggravated when the fish is stressed. Common aquarium diseases include the following:
Amylodinium (marine velvet)
Anchor worms
Cryptocaryon (marine ick)
Dropsy
Fin rot
Skin or Gill Flukes
Ichthyophthirius (white spot or ick)
Oodinium (velvet)
Tuberculosis
Hexamita (hole in the head)
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