Aquarium-fish husbandry
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.]* Beneficial nitrifying bacteria live in the aquarium biofilter. *[Paraphrased derived summary — non-Open-Access source.]* When a tank is set up or disturbed, a temporary rise in ammonia and nitrite is expected. *[Paraphrased derived summary — non-Open-Access source.]* Ammonia and nitrite should be tested until measurable levels fall.