Direct copper evidence exists, but it is not a safe aquarium ppm

The evidence library is allowed to change in public. This page preserves the revised boundary, why it moved and which guides were affected.

What changed

The chemical-safety guide now includes a five-day copper and chlorpyrifos biomarker series and a 96-hour imidacloprid-formulation experiment, with their taxon, treatment-unit and endpoint limits exposed.

Why it changed

Earlier wording did not disclose the direct historical-name copper paper. Its wild-source animals were not independently confirmed as N. davidi, exposures were nominal and the study did not estimate a no-effect level. The imidacloprid work apparently used one exposure tank per treatment, so animal-level measurements do not create independent treatment replication or validate acetylcholine as an antidote.

Sources reviewed for this change

Affected practical guides

A public change is not automatically a retraction. A source may be added, a scope narrowed, a gap refined or an error corrected. The current guide and registry record own the current wording.

Follow or challenge the record

Subscribe to the research-update feed or submit a stable source and proposed correction.