Brook treatment

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Does anyone know where I can get formalin or formaldehyde in canada? I used the last of mine for dips, I asked at the pharmacy and got weird looks.
I have new clowns in QT that are displaying signs of brook. Ive dipped the fish in a formaldehyde dip and treated the tank with quick cure as it contains formalin. How do you guys deal with brook? I got it about 10 years ago from a wrasse and it killed every fish in about 36 hours.

Thanks