siamese fighting fish tattooMost municipal tap water includes chlorine and chloramine, on the way to kill fish, so it’s important to treat tap water properly with a water conditioner before adding it to an aquarium. Once a tank is fully set up with a correctly operating filter bettas prefer low flow settings, substrate, and decor, the water has to be cycled for several weeks before fish are added. Testing kits can help examine when the tank is done biking. This will allow time for a good idea bacteria to grow, that are a must have for breaking down toxic ammonia once fish are added to the tank. These micro organism convert fish waste into nitrates, which can be got rid of only with typical water changes. About 10% of the water in a tank might be got rid of and changed once per week, and a gravel vacuum might be used to take away waste cloth from the substrate.