API Nitrite Test Kit Freshwater Fish Provides trace elements

Provides trace elements

As it grows the yellow turns blue

It is a highly concentrated liquid option for reef aquariums where corals and other calcifying organisms consume calcium and carbonates through growth

because should it inflate with air rather than water it could experience massive problems expelling the air

Includes a replacement safety screw

API Nitrite Test Kit Freshwater Fish Provides trace elementsAPI Nitrite Test Kit API Nitrite Test Kit is a freshwater and saltwater liquid test kit that measures nitrite from 0 to 5 ppm, helping aquarists monitor cycling, biological filtration, and invisible water problems that can harm fish. API Nitrite Test Kit for Freshwater and Saltwater Aquarium Cycling Nitrite is produced as part of the aquarium nitrogen cycle and can rise when fish waste, uneaten food, or biological filter imbalance affects water