Fish Lice (Argulus)
Fish lice look like tiny flat ticks on skin — visible to the naked eye and irritating enough to cause flashing and ulcers.
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Anchor Worms on Aquarium Fish
Anchor worms are visible crustacean parasites — white threads sticking from fish bodies need physical removal plus tank treatment.
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Velvet (Oodinium) Disease
Velvet kills faster than ich — a fine gold dust on skin means act tonight, not next weekend.
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