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MIneral Content
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A calcium block should be placed in the water so that it dissolves slowly over time. The calcium is necessary to keep the turtle's shell strong; without calcium, the turtle's shell will become too soft. Calcium blocks may be purchased at a pet store.
Temperature
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The temperature of the water should be maintained around 72 to 85 degrees Fahrenheit. Turtles are cold blooded animals, and they do not generate their own body heat like mammals. Consequently, their water should ideally be kept at this moderate temperature. In order to do this, you may need an aquarium heater.
Size and Space
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If your turtle is going to be kept indoors, you should use at least a 20 gallon sized aquarium and there should be enough water to be at least as deep as the width of your turtle. If your turtle is a good swimmer, you may want to add more water. If your turtle is going to be kept outdoors, you can create a pond out of a child's plastic pool or similar item. Never use a glass aquarium outside because this can create a "greenhouse" effect and make the environment too hot for your turtle.
Other Water Habitat Items
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You must always make sure there is a nice dry place for the turtle to get out of the water and bask. If a turtle is in the water all the time there is danger of fungal infection. A sandy area can be set aside for a basking area or you can place a large rock or object in the water to create an "island." Plants may also be put in the water, and good plants to use are water hyacinth and water lettuce.
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Can a Change of Water Type Affect a Turtle?
Reptiles are resilient creatures, and turtles are not very high maintenance compared to some other types of pets. However, creating an ideal habitat is still necessary to keep your turtle healthy. The type of water you provide can definitely have a significant impact on your turtle. The type of minerals in the water, the temperature of the water and the amount of water provided can all have an effect.