Ammonia, nitrite and nitrate tests are used to determine if the environment the fish live in is safe or if the water is too toxic. Ammonia and nitrite are very toxic while nitrate is mostly harmless. To eliminate these chemicals, adding more bacterial supplements will cause the cycle to continue at a faster rate. These tests also show how the nitrogen cycle in the tank is progressing. As the cycle progresses, ammonia will decrease while nitrites will increase. So nitrites decrease and nitrates increase. Then the nitrates decrease and your aquarium should be balanced. Some organisms are better suited to living at certain temperatures, so the water temperature must be monitored. Additionally, rapid changes in water temperature can cause problems for the organisms in the aquarium, so the water must be kept at a constant temperature to keep the fish in a stable environment with abundant oxygen. Lower temperatures are able to hold more oxygen. Our fish can live comfortably at temperatures between 68 and 82 degrees Fahrenheit. Cloudy water, water with lots of sediment particles or organic matter, can make it difficult for organisms to acquire or create energy because it can dim light and, depending on the temperature causing turbidity, can cause problems with other properties of the water. water such as ammonia, nitrite and nitrate. To avoid cloudy water, the best solution is to clean the tank and change the water often. Dissolved oxygen is needed by fish to breathe, which, in turn, allows plants to continue filtering water and producing energy. Although these properties are important for both the natural environment and a controlled ecosystem, they are cared for in very different ways. In the natural environment, if human intervention is minimal, the aquatic ecosystem… middle of paper… about the requirements, adaptations and why you chose it. The Black Molly is a variant of the sailfin molly, or Poecilia latipinna. This fish is small and mostly black with short fins. It has also adapted the ability to live in different levels of salt when exposed over time and so can possibly be part of a saltwater or freshwater tank. This fish displays dimorphism through a pointed anal fin and large dorsal fin in the male and round pregnancy spot in the female. Black bears live young and can give birth to 10-60 cubs every 60-70 days. During breeding, the fish requires much more space in the tank. The fish is omnivorous and should be fed a variety of different foods such as algae flakes, tubifex, brine shrimp and freeze-dried bloodworms. We chose this fish because Jorge wanted to have some black fish with our white sand at the bottom of our tank.