What is Reddit's opinion of Protec Humidifier Tank Cleaner – Fight Humidifier, 1 Count (Pack of 1)?

From 3.5 billion Reddit comments

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I got mine at my local drugstore in the humidifier section but you can get them online Cleaning fish

i have been told this is not only not used in ultrasonic humidifiers, but that it is unsafe for the plants. i have found silver to be a better alternative.

Yup.

https://www.amazon.com/gp/product/B01N6MV8SA/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

It IS a fish!

https://www.amazon.com/Pro-Tec-PC1F-Protec-Humidifier-Cleaner/dp/B01N6MV8SA

So we used to, but we bought one of these and it's not even an issue now.