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this prevents substrate from getting into the heater tube
pH is the measure of the acidity or alkalinity of the water in your aquarium
NT Labs Mini Aquarium Lab Test metres m 0Product Description Suitable for freshwater aquariums. Aquarium Water Mini Test kit tests three water parameters: pH, nitrite (NO2) and ammonia (NH3). Full instructions are included to help ensure you carry out the tests correctly, and to help restore perfect water quality should a parameter be incorrect. What is ammonia? Ammonia is excreted by the fish as a waste product. It is extremely toxic to fish, but is broken down into less toxic nitrite by