What Causes Ammonia in a Fish Tank? Why the Reading Is High

Cardinal tetra in a freshwater aquarium

Fish produce ammonia as waste, uneaten food and decay add more, and filter bacteria remove it. A reading above zero usually means waste is outpacing those bacteria, from a new tank still cycling to ammonia in the tap water.

Why Do Fish Jump Out of the Tank? Causes and How to Keep Them In

White betta fish in an aquarium

Fish jump for several reasons: care guides link it to sudden scares, chasing tankmates and poor water, and some species are known jumpers. A jump becomes an escape only through an open top or a gap: fit a tight cover and test the water.