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Old 03-26-2020, 09:48 PM
Senegoid is offline
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Join Date: Sep 2011
Location: Sunny California
Posts: 16,144
Chloroquine (hydroxy- or otherwise) is an anti-malarial drug. Malaria is a parasitic infection. So maybe it's useful for other parasitic infections too.

If I read the stories right, the fish-tank version is not a tank cleaner, but an anti-parasitic drug. You dissolve a tablet in the water, and it treats or prevents some kind of parasitic infections in your fish.