Melo16 Posted July 13, 2022 Share Posted July 13, 2022 It turns out that I, for more than two years, have been using methylene blue in aquariums at every water change, because that is what the store told me to do, but now that I look for more information, I see that they say that this is bad for the fish. Would there be a risk of infection or something like that if I stop using methylene blue on these fish that are already used to it? Link to comment Share on other sites More sharing options...
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