Fish water quality — new tank syndrome; fishless cycling establishes biofilter
The text below is reproduced verbatim from the first-hand source (Merck Veterinary Manual).
> New tank syndrome is a water quality problem that usually occurs within the first 6 weeks after a new fish hobbyist sets up a tank. Owners may report everything was fine for several weeks, and then the fish suddenly become lethargic, anorectic, and frequently die.
Source: pdf-raw/exotic-toxicology/fish.txt (first-hand professional veterinary reference, tag-stripped).
Claims (verified C1 substrings of source_file)
New tank syndrome is a water quality problem that usually occurs within the first 6 weeks after a new fish hobbyist sets up a tank. Owners may report everything was fine for several weeks, and then the fish suddenly become lethargic, anorectic, and frequently die.