Even if your angelfish is small now, it will grow. Angelfish can grow to be about 6 inches long and 8 inches tall. When selecting a tank, make sure it's at least 55 gallons in capacity. If you can afford a tank bigger than this, and fit it in your home, bigger is always preferred. Even if your angelfish does not grow to be very big, it's always better to have more space than necessary. You can measure the pH of your tank using a home testing kit, which you can purchase at most pet stores or online. You should wait 24 hours to test tap water, as the pH will change once it's been exposed to the air. Angelfish require a pH level between 6 and 8.  If you need to raise your pH level, this can be done in several ways. Add crushed coral, which can raise the pH level. You can also add baking soda, shells, and chemical buffers sold at pet stores.  If you need to lower pH levels, adding wood to the tank can help. You can also buy a chemical buffer made to lower pH. Angelfish prefer a tank with a lot of substrate and vegetation. Decorate the tank appropriately to keep your angelfish happy.  Rocks and hiding places are important for angelfish. Stop by your local pet store and pick out a variety of tank decorations. Try to add things like floating drift wood, as this reflects an angelfish's natural environment. Also, plants that stand vertically are great for an angelfish tank. Angelfish thrive at a temperature between 75 and 84 degrees Fahrenheit (24 to 29 degrees Celsius). You will probably have to install a heating system to keep the tank at this level. You can buy a heating system online or at your local pet store. Follow the instructions to set up the system and make sure the water is at the appropriate temperature. You should keep a thermometer in the tank. If the water gets too hot or too cold, adjust your heater accordingly.
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