My freshwater fish have white spots on their fins and body. What is it?

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Answer

White spots on your fish, often resembling grains of salt, are classic signs of Ich (Ichthyophthirius multifiliis), a common and highly contagious freshwater aquarium parasite. If left untreated, it can quickly spread and be fatal. You'll need to treat your tank, typically by slowly raising the water temperature (if appropriate for your fish species), adding aquarium salt, and using an over-the-counter Ich medication, following package directions carefully. Ensure good water quality through regular testing and partial water changes. Speak to Dial A Vet via a video consult should you need further guidance.
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