Softshell Turtle Care Guide

Pet softshell turtles are highly aquatic, fast-swimming turtles with a flat, leathery, skin-covered shell instead of hard scutes, and they need a much larger tank, a soft sand substrate, and more cautious handling than a red-eared slider or box turtle. They're best suited to keepers with some turtle experience already, not a first reptile pet.

Key takeaways:

• The softshells most often available in the US pet trade are the native Florida softshell (Apalone ferox), the native spiny softshell (Apalone spinifera), and captive-bred Chinese softshell (Pelodiscus sinensis) hatchlings, including color morphs like albino.
• A softshell's shell is covered in skin, not hard keratin scutes, which makes it far more vulnerable to cuts, abrasions, and infection from rough substrate or decor than a slider's or box turtle's shell.
• Female Florida softshells can reach roughly 11-24 inches (28-61 cm) in carapace length, nearly double the size of males, making them one of the largest turtles commonly kept as pets in the US.
• Soft, washed play sand or fine river sand is the substrate of choice; gravel and sharp rock can tear a softshell's skin and lead to serious infection.
• Softshells are noticeably more defensive and prone to biting than sliders or box turtles, with a long, flexible neck that can reach further around the shell than most keepers expect.

What Is a Softshell Turtle, and Why Is Its Shell Different?

A softshell turtle is any member of the family Trionychidae, a group defined by a flattened, pancake-like shell covered in leathery skin rather than the hard, plated scutes seen on a red-eared slider or box turtle. That skin-covered shell, combined with a long, tubular, snorkel-like nose, lets a softshell bury itself in sand or silt with just its nostrils exposed and breathe without fully surfacing.

Because the shell is essentially tough skin over a bony plate rather than armored keratin, it's genuinely more fragile than a typical aquatic turtle's shell. A scratch that would mean nothing to a red-eared slider (see this red-eared slider tank setup guide for comparison) can become an open wound and an infection risk on a softshell.

Which Softshell Species Are Actually Kept as Pets?

Three species account for nearly all pet-trade softshells in the US, and they differ meaningfully in size, origin, and legal status.

• Florida softshell (Apalone ferox): native to Florida and parts of southern Georgia and South Carolina, and, per the University of Georgia's Savannah River Ecology Lab species account, the largest New World softshell species. Males run 6-12 in (15-30 cm); females reach 11-24 in (28-61 cm).
• Spiny softshell (Apalone spinifera): widespread across much of the central and eastern US. The USGS Nonindigenous Aquatic Species database lists maximum recorded sizes of about 48 cm (19 in) for females and 24 cm (9.4 in) for males, smaller on average than the Florida softshell.
• Chinese softshell (Pelodiscus sinensis): native to East Asia, where it's heavily farmed for food, and, according to the USGS species profile, a species with an established history of introduction outside its native range. In the US pet trade it's mostly seen as captive-bred hatchlings, including albino and other color morphs, rather than wild-caught adults.

Because Florida and spiny softshells are native US wildlife, many states regulate or restrict collecting or keeping them without a permit, so it's worth checking state and local rules before acquiring a wild-caught native softshell specifically; captive-bred animals from a reputable source sidestep most of that uncertainty.

Tank Size: Why Softshells Outgrow Beginner Setups Fast

A softshell hatchling that fits comfortably in a 20-gallon tank can, within a few years, become an animal that needs 100+ gallons of floor space, and a full-grown female Florida softshell is genuinely one of the largest turtles commonly kept in home aquariums. Because softshells are strong, near-constant swimmers rather than baskers that spend most of their day on land, floor space and swimming room matter more than height, and a wide, shallow footprint generally serves them better than a tall, narrow tank.

Plan for the adult size of whichever species you're keeping from day one rather than upgrading reactively; rehoming a turtle that has outgrown its owner's setup is one of the most common and most avoidable failures in softshell keeping.

Substrate: Why Soft Sand Is Non-Negotiable

Gravel and coarse aquarium substrates are a genuine hazard for a softshell in a way they simply aren't for a slider or a box turtle. Because the shell is skin, not hard keratin, burrowing into or resting on sharp-edged material can scrape or tear it, and that kind of wound is a direct entry point for infection.

• Use fine, washed play sand or river sand, deep enough for the turtle to fully bury itself, since burying is normal, near-daily behavior for this group.
• Rinse sand thoroughly before use to remove dust and debris that can irritate skin or cloud the water.
• Avoid sharp rocks, jagged decor, and anything with rough edges anywhere the turtle can contact it while swimming or burrowing.
• For general guidance on managing a sand substrate layer over time, including keeping it from developing dead, poorly maintained pockets, see this deep sand bed guide; the substrate-handling principles carry over even though it's written with reef tanks in mind.

Water Depth, Basking, and UVB

Softshells are strong swimmers that generally do well in deeper water than a slider needs, but they still need a way to reach the surface easily and a shallow, sandy haul-out area or gently sloped "beach," since even confident swimmers bask periodically. Unlike sliders, softshells tend to bask more secretively, often just at the surface or tucked at the water's edge rather than fully out on a log in plain view, so don't assume a softshell that never climbs onto a dry platform is unhealthy.

A UVB lamp over the basking area is still necessary for proper calcium metabolism and shell health, with basking-spot air temperatures generally kept around 80-90°F (27-32°C).

Temperament: More Defensive Than a Slider or Box Turtle

Softshells have a reputation among turtle keepers as noticeably more bitey and defensive than the sliders and box turtles most beginners start with, and that reputation is well earned. The Florida Fish and Wildlife Conservation Commission's species profile notes that Florida softshells are aggressive when threatened, capable of delivering powerful bites and secreting musk as a defense. Their necks are also long and surprisingly flexible, capable of reaching around toward the back of their own shell, so a hand placed where you'd safely hold a slider isn't necessarily out of reach.

Handle adult softshells minimally, and when you do need to move one, use a container or a firm two-handed grip near the rear of the shell rather than reaching toward the head. This isn't a turtle that tolerates casual handling the way a box turtle often does.

Diet: A Highly Carnivorous Feeder

Softshells are much more strictly carnivorous than sliders, which eat meaningful amounts of plant matter as adults. In the wild, softshells feed heavily on fish, snails, insects, and crustaceans. In captivity, a good diet centers on a high-quality commercial carnivore turtle pellet supplemented with whole prey items like feeder fish, snails, shrimp, and earthworms, plus appropriate calcium supplementation to support shell and bone health.

Given how food-motivated and strike-fast softshells can be, feed with tongs or drop food away from your hand rather than hand-feeding directly, especially with an adult.

Common Health and Husbandry Mistakes

• Using gravel instead of sand: the single most common cause of preventable shell and skin injuries in captive softshells.
• Undersizing the tank for the adult: planning around a hatchling's size instead of the eventual 100+ gallon reality for a species like the Florida softshell.
• Skipping UVB: treating a softshell's more secretive basking style as a sign it doesn't need UVB, when it still does.
• Careless handling: underestimating reach and bite strength, especially with adults.
• Incompatible tankmates: softshells generally don't do well with fin-nipping or bottom-grazing fish; see this discussion of keeping turtles with a pleco for the kind of tankmate questions that come up just as often with softshells.
• Skipping the cycle on a new large tank: a softshell's big adult tank still needs to go through the nitrogen cycle before it's safe to stock, exactly like any other aquarium.