RecoveryTurtles
Red-eared slider care guide
Trachemys scripta elegans
An aquatic turtle that needs a filtered pond-sized volume, not a tank with a rock. Adults commonly reach 10–12 in — plan for 100+ gallons.
Terrestrial — floor space first
Red-eared slider enclosure size
Terrestrial — floor space first. An adult red-eared slider should live in at least 72" L × 24" W × 24" H; we build toward 96" L × 30" W × 30" H (8 × 2.5 × 2.5 ft, roughly 20 sq ft of floor and about a 374-gallon glass equivalent).
Rule of thumb: 10 gallons of water per inch of shell — 100–150 gal for an adult female.
- Hatchling / baby
- 36" L × 18" W × 16" H recommended · min 30" L × 12" W × 16" H
- Juvenile
- 48" L × 24" W × 24" H recommended · min 48" L × 18" W × 20" H
- Adult
- 96" L × 30" W × 30" H recommended · min 72" L × 24" W × 24" H
Temperature and heating
Submersible heater with a guard for the water, plus a halogen basking lamp over the dock.
- Basking / warm surface
- 90–95°F on the dock
- Warm side (ambient)
- Water 75–80°F
- Cool side (ambient)
- Water 75–78°F
- Night
- Water not below 70°F
Lighting and UVB
UVB: T5 UVB 10–12% over the basking dock (UVI 3–5). Run lights on a 12 hours photoperiod, on a timer, and replace UVB bulbs on the manufacturer's schedule even while they still emit visible light.
Humidity
Target Ambient — not applicable; water quality is the equivalent. Test and change water regularly; ammonia and nitrite are the real health risk.
Substrate and depth
Bare bottom or large river stones (no gravel — it gets swallowed). Depth: None needed.
Water and filtration
- Water depth
- At least 1.5–2x the shell length so they can right themselves — 12–18 in for an adult
- Filtration
- Canister filter rated for 2–3x the actual water volume, plus a 25% water change weekly
- Basking dock
- A dry, easily climbed dock large enough for the whole turtle, under the heat and UVB lamps
Enclosure tips and furnishing
- Above-tank or floating basking dock
- Strong canister filtration
- Submersible heater with guard
- Plants or driftwood for cover
Build list
- 100–150 gal stock tank or custom turtle pond — Aquariums that size are rare and expensive; stock tanks work better.
- Canister filter rated 2–3x volume — Turtles are extremely messy; under-filtering causes shell and eye infections.
- T5 UVB 12% + halogen over the dock — Basking dries the shell and drives calcium metabolism.
- Digital thermostat — Every heat source must run through a thermostat — unregulated heat burns animals.
- Two digital probe thermometers + hygrometer — Read the warm side, cool side and humidity directly — stick-on dials are inaccurate.
Red-eared slider FAQ
How big should an adult Red-eared slider enclosure be?
At least 72" L × 24" W × 24" H, and we recommend building to 96" L × 30" W × 30" H — about 8 × 2.5 × 2.5 ft, or a 374-gallon glass equivalent. Terrestrial — floor space first.
What temperatures does a Red-eared slider need?
Basking or warm surface 90–95°F on the dock, warm side Water 75–80°F, cool side Water 75–78°F, night Water not below 70°F. Submersible heater with a guard for the water, plus a halogen basking lamp over the dock.
Does a Red-eared slider need UVB?
T5 UVB 10–12% over the basking dock (UVI 3–5). Photoperiod: 12 hours.
What humidity does a Red-eared slider need?
Ambient — not applicable; water quality is the equivalent. Test and change water regularly; ammonia and nitrite are the real health risk.
What substrate is best for a Red-eared slider?
Bare bottom or large river stones (no gravel — it gets swallowed), at a depth of None needed.
How big does a Red-eared slider enclosure need to be for a hatchling?
Hatchling / baby: 36" L × 18" W × 16" H recommended, minimum 30" L × 12" W × 16" H. Scale up to the adult footprint as the animal grows.
Sources
Put this guide to work
Apply these targets to your own red-eared slider record, then log feedings, sheds and weights against them.