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A glass aquarium of this size will give your gray tree frog plenty of room to roam. Make sure the aquarium you get comes with a secure screen on the top so your frog isn’t able to escape.  You can find an aquarium tank at your local pet store, or you can order one online. When you’re choosing a spot for your gray tree frog’s aquarium, make sure it’s not in direct sunlight since too much sunlight can cause your frog to overheat.  You should also try to place the aquarium in a quiet location since loud noises, like the sound of a TV, can be disruptive to gray tree frogs. Substrate is any kind of material used to line the bottom of a tank or cage. For your gray tree frog, use coconut husk fiber or a soil mixture as a substrate, which you can find at your local pet store or online. You can also use moist paper towels, although they might not look as natural as a fiber or soil substrate.  Avoid using gravel, bark, or reptile cage carpeting as a substrate since they could cause health problems for your gray tree frog and they won’t maintain the proper moisture level in the aquarium.  If you use paper towels as a substrate, dampen them with spring water and not distilled water to avoid potential health problems for your frog. In the wild, gray tree frogs spend most of their time in trees (that’s where their name comes from), and you should recreate this environment in the tank so your frog feels at home. You can use things like driftwood, bamboo poles, cork bark tubes, and even PVC pipe as perches and branches. Spread them out in the cage and lean some against the sides of the aquarium so your frog can explore and rest at different levels. You can find things to use as perches and climbing branches online or at your local pet store. Wild gray tree frogs rely on the canopies of the trees they climb to shelter them and give them a place to hide. Adding plants to your frog’s aquarium can replicate this. Try to position the plants so they’re covering the perches and branches in the tank, which will give your frog places to hide out when it’s climbing around. You can purchase fake plants for your frog’s aquarium online or at your local pet store. Although gray tree frogs spend most of their time climbing branches, they still need access to fresh water to soak in. Use a bowl that’s shallow and small enough for your frog to easily climb in and out of, but make sure it’s big enough for your frog to fully submerge itself in. After you place the bowl in the aquarium, fill it with spring water or dechlorinated water. Avoid using tap water that hasn’t been dechlorinated since it’s not safe for gray tree frogs. You can buy dechlorinating tablets online or at your local pet store so you can treat tap water to use in your frog’s soaking bowl. Gray tree frogs can survive a wide range of temperatures, but you should try to keep the tank within this 10-degree range so your frog is comfortable. Unless you live in a cold climate, you shouldn’t need to use a heat lamp to maintain the right temperature. However, if you’re worried about your frog getting cold, you can set up a low-wattage heat lamp over one side of the cage so your frog can move to that side if it’s feeling chilled.  Attach a thermometer to the tank to monitor the temperature. If it’s too hot in the tank, move it to a darker, cooler area. You can get a low-wattage heat lamp at your local pet store or online.
Get a 20 US gal (76 L) aquarium to house your frog in. Line the bottom of the aquarium with a frog-friendly substrate. Put multiple perches and branches in the aquarium for your frog to climb on. Add fake or live plants to the aquarium to provide shelter for your frog. Place a small water bowl in the tank for your frog to soak in at night. Keep the temperature in the aquarium around 68–78 °F (20–26 °C).