API Copper Cu+ Freshwater & Saltwater Aquarium Test Kit, 90 count

Rated 5 out of 5 stars
$13.70 (-22%)Chewy Price
$17.48Chewy Price
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About This Item


  • Tests copper levels in tap, fresh and saltwater aquariums.
  • Correct copper levels are essential for effective parasitic treatment.
  • Frequent testing is recommended to ensure your tank is healthy.
  • Helps to promote photosynthesis in plants and prevents anemia in fish.
  • Included color chart shows your copper levels compared to the ideal levels, making results easy to decipher.

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Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

About API Testing

Testing the Waters

For fish to thrive, their aquarium water must be similar to the water in their natural environment. Poor water quality can cause stress, illness and even the loss of your fish. Important water quality parameters include ammonia, nitrite, nitrate, and pH. These can vary over time, and they are invisible to the eye, which is why it is necessary to test weekly. Choose from a wide range of API testing options like the Freshwater Master Test Kit or 5-in-1 Test Strips to accurately evaluate your water.

Pressed for Time? Just Dip and Read

Simply dip an API test strip into your aquarium, swirl it twice, and then use the color-coded chart to determine if your water is within safe parameters or if adjustments are needed. That’s it! API test strips are available in a 5-in-1 version, which includes testing for pH, nitrite, nitrate, carbonate, and general hardness. Ammonia and pH test strips are also available so you can mix and match according to your needs.

The Scientific Approach

Get professional results from the comfort of your home with API test kits. Measure up to six parameters with API Master Test Kits, or pick and choose from a wide variety of individual test kits. Both types of kits come with test tubes and a laminated, calibrated color card. API test kits allow for numerous tests, making them an inexpensive way to help keep your aquarium water quality in check.

How to Correct Aquarium Water Parameters

Too Much Ammonia?

Ammonia is released into the water through gills, urine, uneaten food and more. API Ammo-Lock detoxifies it instantly.

Inappropriate pH Levels?

Fish require a specific pH level to thrive. Use API pH Down to lower freshwater aquarium water pH to the right level.

Too Much Nitrite?

Use API Quick Start to quickly consume nitrite and help maintain an active biological filter.

Nitrates Too High?

API Nitra-Zorb helps remove nitrate and other toxins that can be harmful to fish and lead to algae growth.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Fish TypeBetta, Bottom Feeder, Cichlid...Betta, Bottom Feeder, Cichlid...Betta, Bottom Feeder, Cichlid...Goldfish, Marine Invertebrate, Tropical FreshwaterBetta, Bottom Feeder, Cichlid...
Aquarium TypeSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, FreshwaterFreshwaterSaltwater, Freshwater

Questions & Answers

1 Customer Questions

Does it come with the copper?
Answer by ChewyApr 15, 2019
This aquarium test kit does not include a copper additive.

ReviewsWrite a Review

Rated 5 out of 5 stars
2 Ratings
Would recommend to a friend

2 Customer Reviews

Rated 5 out of 5 stars
By 3LittleFish on Jan 15, 2022

Quick and Easy

A quick test to check to see if your copper has cleared from a treated quarantine tank or if you have trace copper from other sources.

Rated 5 out of 5 stars
By MannerPlating on Jan 15, 2021


We use this test to check the quality of our effluent water its great simple accurate test , car enthusiasts we are here if you renovating car and need nuts and bolts zinc plated