Where to find formalin

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I read on RC the tips on clownfish from a clownfish guru, he recommended a formalin dip before putting the clownfish into a quarantine tank, I am going to follow his quarantine procedure because he seems to be experienced and his advice makes sense.

Anyway does anyone know where to find formalin, the best I can find is some products (like Quick Cure) that include formalin as an ingredient. I read that formalin has been banned, not sure if that is true.