These unhealthy conditions can result in fish stress, gill and tissue damage and even death. It includes six bottles of liquid test reagent, a holding tray and a step-by-step instruction booklet with information on how to correct unsafe water conditions. Simply fill a clean test tube with 5 ml of water, add the appropriate test drops and compare results with the color chart. Then follow the recommendations to modify conditions if action is needed. API aquarium treatment supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.