API 5-IN-1 Test Strips for Freshwater & Saltwater Aquariums – 100-Count Box

Effortless water testing for healthy fish

Keep fish healthy and thriving with API 5-IN-1 TEST STRIPS. Designed for both freshwater and saltwater tanks, these strips measure pH, nitrite, nitrate, carbonate hardness, and general hardness. In a single dip, you can view color changes that translate into quick insights about your tank’s water quality. API has been empowering aquarists for nearly six decades, developing premium solutions for families and their underwater world.

The 100-count box ensures you have a steady supply for regular checks without frequent trips to the store. By tracking the five key parameters, you can better understand the environment your fish experience and the minerals that influence it.

What it tests

• pH level to gauge acidity or alkalinity
• Nitrite to flag potential toxic conditions
• Nitrate as a nutrient indicator that can affect health and color
• Carbonate hardness KH to help stabilize pH
• General hardness GH for mineral content

How to use

• Dip a strip into the aquarium water for a few seconds
• Compare the color to the included chart for fast, visual results
• Follow the manufacturer’s general recommendations to adjust water when needed

Why choose API

API’s long-standing expertise informs a reliable approach to water testing. The brand offers a range of testing kits, water conditioners, and foods designed to support diverse tanks while aiming for a healthier underwater environment.

These strips are intended for weekly monitoring and for moments when you notice changes in water or behavior in your fish. They work well for tropical community fish, cichlids, goldfish, and more, helping you stay informed about your tank’s water quality rather than settling for guesses.