"A tank is cycled after a fixed number of weeks"
Use the complete answer. A verdict without its boundary and next action can become another myth.
What is supported
microbial nitrogen processing can become established in aquarium systems.
What is not established
age, nitrate, clear water or a bottled product alone does not prove that one tank can process its intended load.
What to do next
test a known fishless challenge and preserve total-ammonia and nitrite reporting bases. Use the cycling guide.
Exact evidence trace
This is the selected claim-level trace, not every source used by the broader guide. Roles describe how each record is used here; they are not quality grades.
Evidence records
- interpretive context Nitrospira-Like Bacteria Associated with Nitrite Oxidation in Freshwater Aquaria: Aquarium biofilters can contain ammonia- and nitrite-oxidizing communities that differ from older assumptions.
- interpretive context Aquarium Nitrification Revisited: Thaumarchaeota Are the Dominant Ammonia Oxidizers in Freshwater Aquarium Biofilters: Aquarium nitrification is a measurable microbial process rather than a calendar label.
- limitation context Efficacy of quick-start nitrifying products in controlled fresh-water aquaria: A bacterial-start product study does not prove that any product, tank age or appearance establishes intended-load processing.
Supporting authorities
- Definition and Procedure for the Determination of the Method Detection Limit, Revision 2: Keeps not-detected wording tied to the registered method rather than absolute zero.
Named open questions
- What are chronic ammonia and nitrite no-effect ranges for Neocaridina? A direct N. davidi thesis provides a 96-hour acute juvenile experiment. An official abstract for a restricted 2007 N. denticulata thesis reports chronic total-ammonia growth and reproductive comparisons, but its complete methods and results are unavailable. Neither source establishes a chronic operating range, and no controlled chronic nitrite study was located.
- Does a particular filter type or turnover rate improve Neocaridina outcomes? A field survey associated lower current velocity with higher juvenile density, but no assigned aquarium comparison supports a universal turnovers-per-hour rule or one required filter design.
Inspect the broader guide evidence dossier for all records, authorities, gaps, searches and changes connected to the practical guide.
Share the complete answer
Open the plain-text answer or open the original teaching card.
The detailed guide owns the evidence and limitations. Challenge this claim with a stable source if an important boundary is missing or stale.