About Fritz Liquid Test Kits – Copper
Copper is commonly used in aquariums to treat external parasitic infections, like Ich and velvet. It is crucial to closely monitor copper used in aquariums to ensure the correct dose has been applied, especially in volumes of water that are unknown and with copper-sensitive species. This allows the treatment to be effective against the parasites, but still safe for the fish. Some types of copper (e.g. ionic copper) require redosing to maintain a therapeutic concentration and should be monitored regularly. Water should also be tested after treatment to confirm a zero ppm copper concentration before reintroduction of any invertebrates. Copper can also contaminate some tap water and should be avoided or treated before use in the system.
Test Kit Specifications
| Parameter | Value |
|---|---|
| Test Type | Copper (ppm) |
| Detection Range | 0.01 – 10 ppm |
| Test Method | Colorimetric |
| Sample Volume | 10 mL |
| Storage | Store in cool, dry place away from direct sunlight |
FAQ
How often should I test copper levels in my aquarium?
Test copper levels regularly during treatment, especially when using ionic copper which requires redosing. Test after treatment to confirm a zero ppm concentration before reintroducing invertebrates.
Can this test kit detect all forms of copper in aquarium water?
This test kit detects copper in general, including ionic copper. For precise identification of copper compounds, additional testing may be required.
Is the test kit safe to use with sensitive fish species?
Yes, the test kit is designed for safe use in monitoring copper levels. It helps ensure that copper concentrations remain within safe limits for copper-sensitive species.

Audrey Nash –
The test kit is very accurate and easy to use. I used it during a velvet outbreak and was able to monitor copper levels closely. The color changes are clear and the instructions are straightforward. It helped me avoid overdosing and keep my fish safe.
Thomas Parsons –
I found the kit reliable for checking copper after treatment. It’s especially useful when reintroducing snails or shrimp. The results match what I see in my tank, and it’s a small but essential tool.
Oliver Fisher –
Great for tracking copper levels during treatment. The test is quick and the results are consistent. I’ve used it multiple times and it’s become a go-to for my aquarium maintenance routine.