Important Beta Fish Facts: The Tank Setting up a new fish aquarium should be done slowly and carefully. An aquarium is a delicate eco-system in its own right and achieving the right balance of micro-organisms is crucial. You worst enemies in the betta aquarium are ammonia and nitrates (a derivative of ammonia). Ammonia is produced by your betta fish - the more they eat, the more ammonia will you get in the water. Ammonia is also created by particles of decaying plants and excess food. Ammonia in the water is very dangerous to your betta fish. You can monitor the levels of ammonia and nitrates in your betta fish aquarium by using a special test kit. You will need to monitor the ammonia level in your aquarium very carefully. Even over-feeding your betta fish, can cause a sudden rise in ammonia levels in your aquarium, and kill your bettas. To keep the water in your aquarium clean and ammonia free, you have to change approximately 15%-20% of the water every two weeks. When cleaning the tank, use hot water only. Feeding Your betta fish are carnivorous. In the wild, their ancestors fed on a diet of larvae and small insects that may have fallen into the water. If you have access to such natural foods, your bettas will be thrilled to receive them. It's best to feed your betta fish small quantities twice a day. If you can, opt for two different types of food, one in each meal. This is especially important if you are feeding natural foods and not special betta fish food, because your fish need a variety of natural foods for a balanced nutrition. In nature your betta fish would probably be eating more than one type of larvae or insect, so try and provide him with a similar menu at your home. When feeding your betta fish for the first few times, give your fish ten minutes of eating time, and then begin scooping out the leftovers. Once you figure out how much food is actually required, you will be able to safely dish out their daily allotment.