It's relatively rare that tap water would be significantly high in ammonia. Most municipal water systems test the concentration of chemicals like ammonia to ensure that the water is safe to drink. However, it may be worth checking if you're doing everything else right and the ammonia levels are still not dropping.  Use the ammonia testing kit you would use for the fish tank on your tap water. If the ammonia levels are high in your tap water, talk to a representative from your municipal water district. Decomposing material inside the tank is one of the biggest causes of high ammonia levels. By evaluating the contents of your tank's water, you'll have a clearer idea of what needs to be done to correct the problem.  Any decomposing organic matter, including aquatic plants and microorganisms, can cause a spike in ammonia levels as protein breaks down. Uneaten food can also cause spikes in ammonia levels as it breaks down in the water.  Scoop out any matter that shouldn't be in the tank promptly. Make sure you maintain your tank's regular schedule for changing or partially changing the water. If you see a lot of fish waste floating around in your tank, it could be the source of your elevated ammonia levels. Your fish's waste will gradually break down, just like decomposing organic matter, causing ammonia levels to rise in the water. You can manage fish waste by scooping out solids whenever you see them and changing or partially changing your tank's water on a regular basis.
تفقد ماء الصنبور. ابحث عن التحلل داخل حوض السمك. تمييز الأمونيا التي تفرزها أسماكك.