With the Salifert Profi Test NH4 you can determine the ammonia content in freshwater oder seawater exactly and easily. Invertebrates are not tolerate copper. Many remedys for fishes contains copper. With these test you can check if already copper exsists in the aquarium after a cure. The Salifert Profi Test Cu -Copper- can perform approx. 50 measurements in freshwater or marinewater. The pH value must be between pH 7.5 and 9.0 during the test.Do you have questions about this article ?