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Aquatic Turtle Care Guide: Red-Eared Slider, Softshell and African Sideneck

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Red-eared slider turtle basking on driftwood above clear water in a turtle tank
A small turtle in a bowl is how most pet turtle stories start, and how most go wrong. Aquatic turtles live for decades, grow far bigger than the hatchling you bring home, and need three things most fish never do: dry land, a hot basking spot and UVB light. Plan for those from the start and a turtle is a fascinating, long-lived companion.

Quick answer: An aquatic turtle needs clean, filtered water at about 24–27°C, a dry basking area at about 32–35°C, and a UVB lamp so it can absorb calcium and build a healthy shell. Plan the tank for the adult turtle, not the hatchling: a common rule is about 15 liters of water for every centimeter of shell length. Use a filter rated well above the tank volume, a heater guard or stainless-steel heater, and a varied diet. Turtles can live 20–50 years, so they are a long commitment.

Table of Contents

Aquatic Turtle Care Guide: Red-Eared Slider, Softshell and African Sideneck

Three Popular Aquatic Turtles Compared

Turtle Lifestyle Lifespan Key needs
Red-eared slider Semi-aquatic, basks often 20–40 years Large water area, basking spot, UVB, varied diet
Softshell turtle Highly aquatic, fast and active Decades with good care Soft sand, very clean water, no sharp decor, lots of space
African sideneck Semi-aquatic, curious Up to 50 years Big tank, dry basking area, UVB, no small gravel

Red-Eared Slider – The Classic Pet Turtle

The red-eared slider (Trachemys scripta elegans) is named for the red stripe behind each eye. It is hardy and sociable with its keeper, but it is a long-term pet that can live 20–40 years. Adults commonly reach 13–16 cm and older females can grow larger, so the tank has to grow with it. Sliders want water at 24–27°C and a basking spot at 32–35°C under UVB.

Softshell Turtle – The Fast Swimmer

Softshell turtles (Apalone) have a flat, leathery shell instead of hard scutes and spend most of their time in the water, often buried in sand with only the snout showing. They are quick, can bite hard, and their soft shell scratches easily, so they need fine sand, smooth decor and very clean water at about 22–26°C. They are sold small but grow considerably, so they suit keepers who can provide a large tank later.

African Sideneck – The Curious One

The African sideneck (Pelusios castaneus) folds its neck sideways under the shell instead of pulling it straight back. It is hardy and often described as beginner-friendly, but it needs plenty of room: a tank of roughly 340–415 liters for an adult. It is best kept one per enclosure to avoid aggression, and it can live up to 50 years. Avoid small gravel, which it may swallow.

Turtles available now: the Adult Red-Eared Slider (13–16 cm), the Softshell Turtle (sold small, about 5–6 cm) and the African Sideneck Turtle (10–12 cm). Turtles are live animals, so size and colour can vary slightly from the photos.

Before You Buy: The Commitment

  • Decades, not years: plan for 20–50 years of care, including who looks after the turtle when you travel.
  • Space grows with the turtle: a hatchling tank is temporary. Budget for a larger tank as it grows.
  • Turtles are messy: they eat and produce far more waste than fish of the same size, so filtration and water changes matter.
  • Usually one per tank: many turtles become territorial, especially in a small space.

Tank Size and Setup

A widely used rule of thumb is about 15 liters of water per centimeter of shell length. A 10 cm turtle therefore needs roughly 150 liters, and a 15 cm adult roughly 225 liters. More is always better, and water depth should be at least about one and a half times the turtle’s shell length so it can turn over easily.

  • Swimming area: long and wide matters more than tall; turtles swim across the tank, not up and down.
  • Dry land: a stable basking platform the turtle can climb onto fully and dry off on.
  • Substrate: bare bottom is easiest to clean. If you use substrate, choose either fine sand (essential for softshells) or stones too large to swallow.
  • Secure lid or high sides: turtles climb better than you expect.
A starter tank for small turtles: the 50 cm Aquatic Turtle Tank comes with a built-in plastic island and a half cover. It suits hatchlings and small turtles while they grow; it does not include a filter, so add one. Adults and the African sideneck need a much larger setup, and our team can build a custom aquarium to the size you need.

Basking Area, Heat and UVB

Basking is not optional. Turtles climb out to warm up, digest food and dry their shell, which helps prevent shell infections. Under the lamp, the basking spot should reach about 32–35°C, while the water stays cooler at about 24–27°C, so the turtle can move between the two.

  • UVB is essential: it lets the turtle make vitamin D3 and absorb calcium. Without it, the shell and bones weaken over time.
  • Place the lamp safely: above the basking spot, out of reach and away from splashes.
  • Run it on a timer: around 10–12 hours a day gives a steady day-night rhythm.
  • Replace UVB lamps as the maker advises: UV output fades long before the visible light does.
Heat and UV in one lamp: the Aquanature Boshi UVB+UVA 3.0 Halogen Lamp provides gentle heat together with UVB and UVA light for reptiles and turtles. Check the basking temperature with a thermometer after you install it.

Water, Filtration and Heating

Turtles produce a lot of waste, so filtration needs to be generous. Choose a filter rated for two to three times your actual water volume. Canister and strong hang-on-back filters both work, as long as they can be cleaned easily.

  • Treat new water with a water conditioner before it goes in.
  • Heat the water to about 24–27°C for sliders and sidenecks, or about 22–26°C for softshells.
  • Protect the heater: turtles knock things over. A stainless-steel heater or a heater guard prevents breakage.
  • Change part of the water weekly: roughly 25–50%, depending on how dirty it gets.
Filtration and heating: for small to medium turtle tanks, the Jeneca LT-600 Hang-On Filter moves up to 500 L/H; for large tanks, the SunSun HW-304A Canister Filter (2,000 L/h) has plenty of capacity. The XiLong L-399 Stainless Steel Heater stands up to knocks better than glass, and Seachem Safe conditions the water at every change.

Our filtration guide and heater guide explain sizing in more detail.

Feeding Your Turtle

Most aquatic turtles eat both animal and plant food, and young turtles eat more protein than adults.

  • Staple: a commercial turtle pellet made for aquatic turtles, sized for your turtle’s mouth.
  • Greens: leafy greens and aquatic plants, especially for adult sliders.
  • Protein treats: insects, worms or small pieces of fish, in moderation. Softshells are more carnivorous and enjoy worms and live invertebrates.
  • Calcium: together with UVB, calcium keeps the shell hard.
  • How much: juveniles daily, adults every second or third day; remove uneaten food quickly.
Tip: Feeding in a separate container keeps the main tank much cleaner. Long tweezers let you hand-feed treats safely, out of range of a hungry bite.
Feeding tool: 20 cm Stainless Steel Aquarium Tweezers, straight or curved, are made for tank maintenance and for feeding reptiles. Ask us about turtle food options when you order your turtle.

Weekly Care Routine

  • Daily: check the water and basking temperatures, feed, and remove leftovers.
  • Weekly: change 25–50% of the water with conditioned water and wipe the basking area.
  • Every few weeks: rinse the filter media in removed tank water, never under the tap.
  • Every few months: check the UVB lamp’s age and replace it as the maker advises.

For the general principles of water changes, see How Often Should You Change Your Aquarium Water?

Health Warning Signs

  • Swollen or closed eyes: often linked to poor water or diet. Improve both and seek advice.
  • Soft or deformed shell: usually missing UVB or calcium.
  • White patches, pits or a bad smell from the shell: possible shell infection; dry basking and clean water help prevent it.
  • Floating lopsided, wheezing or bubbles from the nose: possible respiratory infection, often from water that is too cold.
  • Not eating for a long time: check temperatures first.
Warning: Turtles with symptoms like these should be seen by a vet who treats reptiles. Do not wait for a respiratory or shell infection to clear on its own.

Hygiene and Responsible Ownership

  • Wash your hands with soap after handling a turtle or its water. Turtles can carry Salmonella, so supervise young children.
  • Keep turtle equipment separate from the kitchen sink and food areas.
  • Never release a turtle into the Nile, canals, lakes or any natural water. Released pet turtles harm native wildlife and rarely survive well. If you cannot keep your turtle, ask us about rehoming it.

Frequently Asked Questions

What size tank does a turtle need?
A common guide is about 15 liters of water per centimeter of shell length, planned for the adult size. The African sideneck needs roughly 340–415 liters as an adult.
Do turtles need a heat lamp and UVB?
Yes. Basking heat helps digestion and keeps the shell dry, and UVB lets the turtle absorb calcium for a healthy shell.
What water temperature do turtles need?
About 24–27°C for sliders and sidenecks, about 22–26°C for softshells, with a basking spot of about 32–35°C.
How long do pet turtles live?
Red-eared sliders 20–40 years, and African sidenecks up to 50 years with good care.
Can turtles live with fish?
Turtles usually eat or chase small fish, and their waste is hard on fish. A turtle-only tank is the safest choice.
Can I keep two turtles together?
It depends on the species and space. Many turtles become territorial, and the African sideneck is best kept alone.
Is a softshell turtle good for beginners?
It is more demanding than a slider: it needs soft sand, very clean water and a lot of space as it grows, and it can bite hard.

Conclusion

Water to swim in, a warm dry place to bask, UVB light, strong filtration and a varied diet: give a turtle those five things and plan for the adult, and it can be with you for decades.

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