Fungus Treatments Most fungal diseases have a white, cottony appearance and are easily identified. Aquarium fungal medications should be kept handy as fungi are naturally present in most aquariums. Fish are at risk for fungal infection when they are recovering from illness or wounds, when there are other sick fish around, if fish are stressed, and when your aquarium isn't cleaned properly or enough(especially when there is decomposing matter, like another dead fish). Use aquarium fungal medications at the first sign of fungal infection and quarantine whenever possible.
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