Turtle Tank Setup: Everything Your Aquatic Turtle Needs

Aquatic turtles such as red-eared sliders, painted turtles and map turtles are fascinating pets, but they're a long-term commitment — many live for decades and grow much bigger than the hatchlings sold in shops. A proper setup keeps them healthy from the start.

1. Tank size: plan for the adult

A common rule of thumb is about 10 gallons of water per inch of shell length. A hatchling can start smaller, but you'll need to upgrade as it grows. Deep water lets turtles swim properly; make sure they can easily reach the surface.

2. Filtration: go big

Turtles are messy. A strong filter — rated for well above the tank's volume — makes water care much easier. Canister filters are popular because they hold lots of media and sit outside the tank.

3. A dry basking area

Every aquatic turtle needs to climb fully out of the water to dry off and bask. A floating dock rises and falls with the water level and saves space.

4. Heat and UVB

Turtles need a basking lamp over the dock to create a warm spot, plus UVB lighting. UVB helps reptiles make vitamin D3 to use calcium — without it, shells and bones can't develop properly. Learn more in our reptile lighting and calcium post.

Most aquatic turtles also need water kept within a set temperature range — check the needs of your species and use a submersible aquarium heater with a guard if required.

5. Water care

Use a water conditioner to remove chlorine and chloramine when filling or topping up, and change part of the water regularly. Test strips help you keep an eye on nitrite and nitrate.

6. Diet

A quality floating pellet makes a good staple, plus leafy greens and occasional treats appropriate for your species. Feed only what your turtle eats in a few minutes to keep the water clean.

A note on hygiene

Reptiles, including turtles, can carry Salmonella. Wash your hands after handling turtles or anything in their tank, keep turtle equipment out of the kitchen, and supervise young children.

At a glance