Fish water quality — new tank syndrome; fishless cycling establishes biofilter
Source: Merck Veterinary Manual (merckvetmanual.com), a copyrighted professional veterinary reference. Per COPYRIGHT_POLICY §3, the points below are paraphrased derived fact summaries: numerical values and proper nouns are preserved from the source, but sentences are rewritten and not quoted verbatim.
Claims
*[Paraphrased derived summary — non-Open-Access source.]* "New tank syndrome" is a water-quality problem usually appearing within the first 6 weeks of a new tank; owners may report weeks of normal behaviour then sudden lethargy, appetite loss, and frequent deaths.