Flashing (fish darting and rubbing against surfaces), clamped fins, and visible spots or growths are the usual first signs of a parasite problem.
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Common Types
External parasites like ich and anchor worms are visible on the fish itself. Internal parasites are harder to spot and often only show up as weight loss or lethargy.
Where They Come From
New fish, plants, or even water from an untested source are the most common way parasites enter an established pond.
