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For questions related to guppies - popular, polymorphic, live-bearing, tropical aquarium fish characterized by remarkably visible sexual dimorphism. Please include other tags relevant to the issue, such as [health] or [feeding].

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Female guppies are fine, but male is sick

High concentration of nitrite ions (1 mg/L of NO2-) is the most concerning thing in the list of your water parameters; it is many times above the toxicity threshold, because nitrites may start to beco …
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