Red-Eared Slider (Trachemys scripta elegans) Care Guide
How to keep a red-eared slider: a large heated aquatic tank, dry basking platform with UVB and heat, strong filtration, and a decades-long commitment.
Overview
The red-eared slider (Trachemys scripta elegans) is a semi-aquatic freshwater turtle named for the red stripe behind each eye. It is the most commonly kept pet turtle in the world, but it is poikilothermic (cold-blooded) and leaves the water frequently to bask and warm its body. It is a long-lived, demanding animal rather than a beginner-friendly fish-tank pet.
Natural Range & Size
The species is native to the central and southern United States and northern Mexico, around the Mississippi River and the Gulf of Mexico, in still warm water such as ponds, lakes, swamps, creeks, streams and slow-flowing rivers.
- Typical adult carapace: 15-20 cm (6-8 in); some exceed 40 cm (16 in).
- Wild lifespan: usually 20-30 years, some over 40 years; often longer in captivity.
- Brumates (slows down) when temperatures fall below 10 C (50 F).
Aquatic Setup & Filtration
Provide roughly 10 gallons of water per inch of shell; a single adult needs at least a 125-gallon tank, adding about 15 gallons per extra turtle. Turtles foul water quickly, so an external canister filter is essential for adults to control waste and harmful bacteria.
Basking & UVB / Temperature
A dry basking site lets the turtle fully dry its shell and reach the heat it needs for digestion and metabolism. UVB light drives vitamin D3 synthesis, which is required for calcium absorption and healthy shell and bone.
- Water temperature: about 72-76 F (22-24 C) for adults.
- Basking surface temperature: about 88-92 F (31-33 C).
- Provide both UVA and UVB lighting over the basking area.
Diet
Red-eared sliders are omnivores whose diet shifts with age. Juveniles are largely carnivorous and need a high-protein intake for growth, while adults rely heavily on aquatic plants as their main food. Offer a varied diet and avoid overfeeding.
Health & Longevity
With correct heat, UVB and clean water a slider can live well past 20-30 years, so adoption is a multi-decade commitment. Poor UVB or diet causes metabolic bone disease and shell deformities; dirty water leads to shell and skin infections. In the US, selling chelonians under 4 inches (10 cm) is banned by the FDA due to salmonella risk.
Common Mistakes
- Housing in a small fish tank with no dry basking platform.
- Skipping UVB lighting, leading to soft shell and bone disease.
- Weak filtration, leaving fouled water and infections.
- Releasing unwanted turtles outdoors, which spreads this invasive species.