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System observation or method study Adjacent aquarium-system evidence

Microbial community succession of home aquarium biofilters associated with early establishment of comammox Nitrospira

McKnight et al., 2025. ISME Communications 5(1): ycaf212.

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This record is a claim boundary, not a quality badge. Evidence class and species relationship describe what was studied. They do not make the result universal, complete or automatically applicable to a home aquarium.

Source taxon as published
Home aquarium biofilter microorganisms, not a Neocaridina animal experiment
Environment
Three independently established home freshwater aquaria followed for twelve weeks
Life stages
not applicable
Reviewed
2026-08-12

What was studied

Study shape: Weekly bead, sponge and water samples were paired with chemistry, qPCR and community sequencing while stocking and maintenance varied by home.

Experimental unit: Home aquarium, n equals three; repeated samples and technical replicates remain nested within aquarium

Endpoints: total ammonia, nitrite, nitrate, amoA abundance, microbial community succession.

Claim boundary

What it can support: Nitrification timing and nitrifier succession differed among the three aquaria, with comammox Nitrospira prominent later in every sampled biofilter.

What it cannot support: Three uncontrolled home systems do not establish a universal three-week or eight-week cycle, a product effect or commissioned animal capacity.

Publication status audit

Canonical DOI outside query result

The record has a canonical DOI but did not appear in the broad Neocaridina query. It requires DOI-specific or alternative-registry status review before any no-update statement.

Metadata snapshot reviewed 2026-08-12. Inspect the method, unmatched queue and limitations.

Correction impact

If this source boundary changes, these are the known downstream consumers. The list distinguishes scientific re-review from generated parity and historical follow-up.

Editorial review required (6)

This curated wording or synthesis must be reconsidered when the source boundary changes. A passing generator test cannot decide the new scientific meaning.

  • cycling decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • filtration decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • nitrogen decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • cycling practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • filtration practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • nitrogen practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.

Generated from governing registry (16)

This surface derives from a governing registry and should update with it, but release tests must still prove parity and routing.

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How this record is classified

System observation or method study: An aquarium, analytical or biological system was observed without an assigned Neocaridina animal treatment. The species relationship still identifies whether the evidence is biological or system-adjacent.

Adjacent aquarium-system evidence: The source studied aquarium chemistry, filtration, measurement or another engineered system rather than a Neocaridina animal endpoint.

Topics: Filtration, Nitrogen waste

Critically appraise this source without a score

These questions fit this record's system observation or method study role. They are prompts, not automatic judgments. Open the original source to answer them.

  1. Identity and provenance: How were the organism, population, stock and life stage identified and sourced? A published name or seller label can hide a taxonomic, population or life-stage transfer.
  2. Independent unit: What unit was independently assigned or sampled, and how many units support each comparison? Animal counts do not create independent replication when animals share a vessel, site, family or treatment history.
  3. Comparison and context: What was the actual comparator, allocation process, environment, duration and material condition? A result has meaning only against the comparison and conditions that produced it.
  4. Endpoint and measurement: Which endpoint was measured, with what method, unit, timing, resolution and decision rule? One endpoint cannot silently become survival, welfare, diagnosis, reproduction or long-term population performance.
  5. Denominators and missingness: Are starting counts, exclusions, losses, missing observations and analysis denominators reconciled? Unreported or changing denominators can alter the apparent direction, precision and applicability of a result.
  6. Transfer boundary: What is the nearest tempting aquarium claim that this source design cannot establish? Direct evidence can still be narrow, and adjacent evidence can be useful only while the inference remains visible.
  7. System relationship: Was the measured unit an aquarium system, analytical method, another taxon or another biological level? A system or method result is not automatically a Neocaridina animal response.
  8. Inference mechanism: What explicit mechanism or shared property makes the adjacent evidence relevant? Similarity must be stated and tested rather than assumed from a broad label.
  9. Target validation: Has the method or inference been validated in Neocaridina, the intended water, life stage and decision range? Analytical validity in one matrix or biological validity in another species may not transfer.
  10. Permitted use: Is the source being used only for its method or system role rather than promoted to animal evidence? Useful adjacent evidence becomes misleading when its role is silently upgraded.

Read the complete appraisal framework.

Where it is used

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