Red-Eared Slider
Turtles & Tortoises
The iconic pet turtle that grows much larger than the pet store suggests!
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🤓 Did you know? Red-eared sliders are one of the world's most invasive species. Released or escaped pets have established populations on every continent except Antarctica!
🗓️ The first week
The numbers a new owner needs in the first week, each from the article it links to. Rows with no link come from the encyclopedia.
- Legal
- Federal law bans the sale of turtles under 4 inches, not ownership. State invasive-species laws are what restrict sliders, so check yours before buying, and never release one into a pond: illegal nearly everywhere.Legal guide →
- Tank size
- Roughly 10 gallons of water per inch of shell, so a practical adult minimum of 75 to 100 gallons for one turtle, 100 to 125 better. A hatchling's tank is temporary; size for the adult it becomes.Setup guide →
- Water
- 72 to 82°F, held steady, at a depth of 1.5 to 2 times the shell length: enough to right itself, not so deep a weak turtle cannot surface. Changed at least weekly, since a filter is not a substitute.Setup guide →
- Basking
- A surface of 85 to 95°F on a platform that lets the turtle dry fully, with cool-side air in the mid-70s to low 80s and nights in the mid-60s to mid-70s.Setup guide →
- UVB
- Mandatory: a linear T5 HO at a UV index of 2.0 to 3.0 at the basking surface, 10 to 12 hours a day, replaced every 6 to 12 months even if it still lights.Setup guide →
- Filtration
- A canister rated well above the tank volume. Sliders produce a lot of waste, and over-filtering is the reasonable recommendation.Setup guide →
- Substrate and lid
- Bare bottom, or rock bigger than the turtle's head. No sand or small gravel, which gets swallowed. A secure lid: they climb.Setup guide →
- Nesting site
- A gravid female with nowhere to lay risks egg-binding.Setup guide →
- Adult size
- Females average a 25.4 cm (about 10 inch) shell, males 17.78 cm (about 7 inches).Setup guide →
- Feeding schedule
- Juveniles daily, adults every 2 to 3 days, what it finishes in 15 to 20 minutes, always in the water, since a slider cannot swallow on land.Feeding guide →
- Diet split
- Young turtles need more animal protein; adults shift toward plants, from about half protein down to as little as a quarter. The shift with age is the part that matters.Feeding guide →
- Supplements
- A reptile multivitamin about weekly and a calcium block or cuttlebone about twice a week.Feeding guide →
- Brumation and refusal
- Appetite drops roughly October through March, though a warm indoor slider often does not fully brumate. Outside brumation, 2 to 3 weeks of total refusal is the point to see a vet, sooner with lethargy.Feeding guide →
- Handling
- Scooped from underneath with the full body supported, never from above. A drop can kill a turtle this size, and the sharp beak draws blood.Handling guide →
- Cohabiting
- Several sliders without enough space and basking spots means aggression, stacking, and injuries.Handling guide →
- Budget
- Roughly $550 to $1,250 or more upfront and $380 to $720 a year. A wellness exam runs $80 to $180, an emergency $150 to $400 before treatment.Cost guide →
- Lifespan
- 20 to 30 years, 20 to 25 typical.Cost guide →
- Hygiene
- Wash hands with soap after any contact with the turtle, its tank, or its water, and never clean any of it in a kitchen sink or a bathtub people use.Hygiene guide →
🚨 Emergency card
Call the vet now if you see any of these.
- Difficulty breathing, or an inability to dive or swim properly
- Severe lethargy
- Deep shell lesions, or a large abscess
Book a vet visit promptly for these.
- A complete refusal to eat for 2 to 3 weeks outside the October to March brumation slowdown, sooner with lethargy
A reptile vet. A soft shell is bone disease; a hard shell with peaked scutes is pyramiding. Respiratory infection progresses quickly, and an ear abscess almost always needs surgical drainage and antibiotics. Annual or semi-annual exams catch most of this early.
📰 Where to go next
How Much Does a Red-Eared Slider Really Cost?
What the turtle costs against what it grows into: the adult-sized setup, the yearly running total, routine and emergency vet prices, and why the lifespan is the real budgeting number.
Red-Eared Slider Tank Setup: Plan for the Adult, Not the Hatchling
The 10 gallons per inch rule and the adult minimum it produces, water and basking temperatures, water depth, Ferguson Zone 3 UVB, substrate, and the filtration that has to keep up.
How to Handle a Red-Eared Slider
Why brief and necessary handling suits this species, the scoop from underneath, the bite and the beak behind it, hand-feeding, and what housing two sliders together costs.
Common Red-Eared Slider Health Issues and What Causes Them
Metabolic bone disease against pyramiding, which are not the same problem, shell rot, respiratory infection, aural abscesses, vitamin A deficiency, and what counts as an emergency.
Red-Eared Slider Feeding: Schedule, Diet, and Why They Stop Eating
The schedule by age, the portion cue, the protein-to-plant shift no source will put an exact number on, safe and unsafe foods, and seven reasons a slider stops eating.
Red-Eared Slider Enrichment: Escape Behavior Is the Measurement
The pond slider study that measured escape behavior, the priority order it argues for, and why water volume comes before any object you can buy.
Is It Legal to Own a Red-Eared Slider? State-by-State Guide
The 1975 federal sale rule that never banned ownership, the states that do restrict one, Colorado's 2026 invasive classification, and why release is illegal nearly everywhere.
🛒 What to buy
Prices and the reasoning behind each item are in How Much Does a Red-Eared Slider Really Cost?.
❓ Frequently Asked Questions
How big of a tank does an adult red-eared slider need?
A practical minimum of 75 to 100 gallons for one turtle, with many experienced keepers recommending 100 to 125 gallons or more. The rule of thumb is roughly 10 gallons of water per inch of shell length, and females, which commonly reach 10 to 12 inches or more, need proportionally more space than males.
How long do red-eared sliders live, and why does that matter for budgeting?
20 to 30 years is the consensus range, with a handful of far less documented claims reaching 40 to 70 years. This is a multi-decade commitment, and the setup you buy for a palm-sized hatchling needs to work for an animal that will eventually need a 75 to 100-plus gallon home.
Does the federal 4-inch turtle rule mean it's illegal to own a red-eared slider?
No. The 1975 FDA rule only bans selling turtles with a shell under 4 inches, to cut down on salmonella exposure in young kids. It has never applied to owning one, buying an adult-sized turtle, or keeping one you already have.
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⚖️ Legal Guide
📰 Deep Dive
🐢 How Much Does a Red-Eared Slider Really Cost?
🐢 How to Handle a Red-Eared Slider
🐢 Common Red-Eared Slider Health Issues and What Causes Them
🐢 Red-Eared Slider Tank Setup: Plan for the Adult, Not the Hatchling
🐢 Red-Eared Slider Feeding: Schedule, Diet, and Why They Stop Eating
🐢 Red-Eared Slider Enrichment: Escape Behavior Is the Measurement
🩺 Health and More
🔌 Reptile Emergency Plan: Power Outages, Travel, and Pet Sitters
💧 Reading Reptile Stool, Urates, and Hydration: A Daily Health Check
🧼 Salmonella and Reptile Hygiene: The Rules That Actually Matter
🌡️ Reptile Heating and Thermostats: Preventing Burns
🐢 Tortoise Brumation: Which Species, and How to Do It Right
🐢 Tortoise Sexing, Eggs, and Egg Binding