The red-eared slider is one of the most widely kept aquatic turtles, recognised by the red stripe behind each eye.
Cheap hatchlings are sold in tiny bowls, but they grow into large, messy, long-lived turtles that need a substantial aquatic setup and decades of care.
Underestimating their size, mess and lifespan leads to many being released, where they become a damaging invasive species in many countries; in some places sale or release is now restricted.
Acquire one only with the space, filtration budget and 20-to-30-year-plus commitment they genuinely require.
Housing
An adult needs an aquarium or pond of at least 280 litres (75 gallons) for one turtle, with several times its shell length in swimming depth, plus a dry basking platform.
The basking area should reach 31-35C under a heat lamp, with water held around 24-26C by a submersible heater; keep juveniles and sick turtles warmer.
They produce heavy waste, so a powerful external or canister filter rated well above the tank volume is essential, along with regular water changes.
A UVB lamp over the basking dock is required for shell and bone health.
Keep the basking zone genuinely dry so the turtle can fully warm and dry off.
Diet
Red-eared sliders are omnivores whose diet shifts with age.
Hatchlings and juveniles are more carnivorous, while adults eat increasingly plant matter.
Feed a quality commercial aquatic turtle pellet as a base, plus leafy aquatic greens, and offer protein such as appropriately sized insects for younger turtles.
Feed juveniles daily and adults every two to three days, removing uneaten food to protect water quality.
Provide calcium via a cuttlebone.
Over-feeding, especially fatty protein and processed treats, plus low-calcium or low-UVB conditions, drives obesity, fatty liver, shell deformity and metabolic bone disease.
Health
A healthy slider has a hard, smooth shell, clear eyes, a strong swim and a good appetite.
Common problems include shell rot and soft shell from poor water quality or insufficient UVB and calcium, respiratory infection (gaping, listing in the water, bubbling) from cold water, and swollen eyes linked to vitamin A deficiency.
Poor water quality underlies most illness, so filtration and water changes are central to health.
Sliders can carry Salmonella, so hand-washing and supervision around children matter.
Any turtle floating abnormally, refusing food or labouring to breathe should see a reptile-capable exotics vet.
Temperament
Red-eared sliders are active, alert, strong swimmers that quickly learn to beg at feeding time, which many owners enjoy.
They are not affectionate and generally dislike handling, which can stress them, and larger turtles can deliver a painful bite if mishandled.
They do not need company and are often best kept singly, as multiple turtles increase waste, competition and aggression, and adult males may harass tank-mates.
If kept together, they need much more space and careful monitoring.
For most keepers, one well-housed turtle is the simplest and kindest choice.
A good fit for
Keepers with room for a large aquatic setup
People who enjoy watching rather than handling
Owners ready for heavy filtration and water changes
Those committed to 20-30+ years of care
Common mistakes to avoid
Tiny tanks and bowls for a growing turtle
Weak filtration causing chronic poor water quality
Never releasing one outdoors (invasive)
Missing UVB and basking heat
Is your enclosure big enough?
Minimum volume280 litres (74 US gallons)
CompanyFine alone or with company. Can live singly; not dependent on company
For aquatic turtles the water quality is half the medical history.
Go now
Swimming lopsided, or unable to submergeGo now. Usually respiratory, and a turtle that cannot dive cannot feed.
Now
Today
Soft or pitted shell, or white patches that lift awayBook, and test the water. Shell rot follows poor water quality or a basking site that never fully dries the animal.
This week
Puffy or closed eyesBook today and check the water. Often vitamin A deficiency plus dirty water.
Today
A turtle needs a basking site that gets it fully dry and properly warm. Half the common problems trace back to a dock that does neither.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it — and the time to find one is before you need one.
Can a red-eared slider eat that?
Reptile diets split hard by species. An insectivore and a grazing tortoise share almost nothing, so check the species guide as well as this list.
Never (15)
AlcoholNo safe amount at any body weight on this site.
never
AvocadoPersin. Fatal to many reptiles.
never
CaffeineCoffee, tea and energy drinks. Cardiac and neurological toxicity at tiny doses for an animal this size.
never
ChocolateTheobromine and caffeine. Small mammals and reptiles cannot clear either.
never
CitrusToo acidic, and it interferes with calcium absorption.
never
Dog or cat foodProtein and vitamin D levels formulated for a mammal. In tortoises it causes irreversible kidney and shell damage.
never
FirefliesLucibufagins. A single firefly has killed adult lizards. This is the most dangerous item on any reptile list and it is the one keepers do not know about.
never
Fish caught from the wildThiaminase and parasite risk for turtles and aquatic species.
never
GarlicSame allium toxicity as onion, and more concentrated by weight.
never
Iceberg lettuceWater with no nutrition. It fills a reptile up in place of food that would have done something.
never
LeekAllium family. Same mechanism as onion and garlic.
never
OnionOrganosulphur compounds damage red blood cells. The whole allium family is out.
never
RhubarbOxalate load high enough to cause acute kidney injury.
never
Salty or seasoned human foodSalt, oil and seasoning. Crisps, chips, seasoned leftovers and processed meat are all out.
never
Wild-caught insectsPesticide residue and parasites, and the identification risk. Captive-bred feeders only.
never
Rare treats (1)
WaxwormsVery fatty. Useful for a underweight animal or for medicating, addictive otherwise. One or two, rarely.
rare treat
Occasional (5)
Bell pepperSafe, low oxalate, and the colour gets a refuser eating. A few small pieces a few times a week.
occasional
Butternut squashWell tolerated and a useful source of vitamin A precursors. Small cubes a few times a week.
occasional
KaleGood calcium, mild goitrogen. Rotate it. Twice a week.
occasional
MealwormsHard chitin shell and a poor calcium ratio. Fine as part of a varied feed, poor as the whole diet. A few, alongside better feeders.
occasional
SpinachOxalates bind dietary calcium, which is the last thing a reptile at risk of metabolic bone disease needs. A very small amount, rarely.
occasional
Everyday foods (6)
Black soldier fly larvaeUnusually high in calcium; one of the few feeders that does not need dusting. Several per feed.
everyday food
Collard greensOne of the best staple greens for herbivorous and omnivorous reptiles. Daily.
everyday food
CricketsA standard feeder. Gut-load them for 24 hours before offering, or you are feeding an empty shell. Sized no wider than the space between the animal's eyes.
everyday food
Dandelion greensExcellent calcium-to-phosphorus ratio and readily taken. Pick away from sprayed ground. Daily, for herbivorous species.
everyday food
Dubia roachesBetter calcium ratio and more meat per insect than crickets, and they cannot climb glass. Sized to the animal.
everyday food
Mustard greensGood calcium ratio; rotate with other greens. Several times a week.
everyday food
That food is not on our list. Reptile diets are narrower than they look — check the species guide, and ask an exotics vet before offering anything unfamiliar.
Dust feeders with a calcium supplement to the schedule in the species guide. A reptile can be eating well and still be starving of calcium.
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
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