Contains one (1) API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, including 1 bottle of testing solution, 1 color card and 1 glass test tube with cap ...

But even if your aquarium tank looks clean, your fish might be in trouble. Most freshwater fish need a tank with a pH level between 6.8-7.6 to stay healthy.

1. pH Test: Use pH test strips or a pH meter to check the water's acidity level. Aquarium test kits test the water pH, ammonia, nitrite, and nitrate levels. 2.