Prevent loss in your aquarium with the API Ammonia Freshwater & Saltwater Test Kit. Ammonia is the number one killer of tropical fish, so testing your levels is an essential part of fishkeeping. Tropical fish continually release ammonia through their gills, urine and solid waste, and it also accumulates through uneaten fish food. Even with biological filters an imbalance can quickly occur, which damages gill membranes and prevents normal respiration, and it also suppresses the immune system. Lucky for you, this kit makes it easy to see if your ammonia levels are too high so that you can take quick action. Using a color coding system that is easy to read, simply combine a few drops of the aquarium water in the included test tube with the solution, and review your accurate results.