Claim checked: "Any copper kills shrimp or copper is safe"

What is supported: copper is biologically relevant and can be toxic; effects depend on concentration, chemical form, water chemistry, exposure and endpoint.

What is not established: an ingredient name alone proves a product is lethal or safe, and one acute value is not a home target.

Do next: identify the product, dose, copper fraction, water context and measured animal outcome before acting.

Detailed guide: https://moltandmoss.com/care/chemical-safety
Full claim check: https://moltandmoss.com/care/claims/copper-absolute