Tank water gets cloudy when treating with formalin ms. Why?

Stubborn flukes can be treated with formalin when other methods do not work. Also some aquarists will mistreat/misdiagnose a disease and utilize formalin. As to your original question I've only done formalin dips to treat brook so no real experience treating a QT. Is the water still cloudy? I'm sure you are keeping an eye on ammonia as formalin will destroy the bacterial filter.
 
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