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Aquatic newts need a proper aquarium set-up to live happily. A 10-gallon (38 L) tank is a good choice, but a larger tank is generally better. Don't place your newt in anything smaller. Newts do well when there are at least two in a tank. Consider getting two newts, which can live happily in a 10-gallon (38 L) tank. Though the newt is named an aquatic newt, they need both land and water in their aquarium. Consider making your aquarium 70% water and 30% land. The tank needs enough land area for your aquatic newt to come completely out of the water and onto the land.  Slope aquarium gravel up towards one edge to create an island or place a large rock inside with a slope for your newt to climb up. Make sure the slope is not too slippery since newts sometimes have trouble climbing. The slope should be gradual instead of steep. Their feet can slip on steep slopes. Aquatic newts will spend most of their time in the water. Placing enough water in the tank helps ensure they stay healthy. The water should be at least 10 inches (35 cm) deep. The newt should be able to move around while completely submerged under the water.  You should only use dechlorinated water. Chlorinated water or water with other chemicals can harm or kill your newt. To dechlorinate your water, use special reptile dechlorinating tablets which you can purchase online or at pet stores. You can also use spring water. You can buy spring water at any grocery store or supermarket. Never use water directly from the tap. The chemicals in it will kill your newt. If you're going to use water from the tap, you must let the water sit out in an open container for at least 48 hours or longer so that the chemicals can evaporate out of the tap water before adding it to your newt's tank. Washed aquarium gravel should be placed along the bottom of the tank. Place a layer of gravel that is two inches (5 cm) thick. You can gradually stack the gravel so it slopes out of the water to give your newt a place to get out of the water. Consider using large, smooth, round stones for gravel. Your newt won't be able to eat it and it won't be so sharp that it'll cut your newt's feet. Small aquarium gravel can be too small for a newt. Choose gravel or stones that are larger than your newt's feet. The water inside your newt's tank will get dirty, so you need to use a filter. The filter will depend on how much water is in the tank. Try to get the smallest filter you can to limit the strength of the flow. Smaller filters will need to be changed more often. You will need a lid for your aquarium. Newts are escape artists and will crawl out of any crack they can find. Use a screen lid to make sure there is enough ventilation for your newt. Make sure the mesh of the screen lid is small enough that your newt can't slide through. Newts need full spectrum lighting with UVB rays. It should be turned on for 10 to 12 hours each day. You can place it on a timer so your newt always gets the proper amount of light.
Buy an aquarium. Create the right ratio of water to land. Add enough water. Line the tank with gravel. Use a filter. Cover the tank with the appropriate lid. Provide a UVB light source.