Common Musk Turtle — care sheet

Beginner–Intermediate. A great "first turtle" if you go in with real expectations: they stay small, tolerate a range of temperatures, and are hardy. The intermediate part is the water — heated, filtered, and kept genuinely clean — plus a 30–50-year commitment. The setup work is front-loaded; the daily care is simple once it's dialed in.

Predominantly carnivorous. Base the diet on a quality aquatic-turtle pellet (Mazuri Aquatic Turtle Diet, ReptoMin) plus varied protein: earthworms, snails, crickets, ghost/frozen shrimp, and small pieces of fish. Feed juveniles daily; feed adults every other day (or 3–4×/week) to prevent obesity. Adults will also nibble aquatic plants. Skip wild-caught snails/insects (parasite and pesticide risk).

A 20-gallon long tank is the realistic minimum for one adult, with 30+ gallons better; many keepers and bioactive guides recommend stepping up to a 40–75-gallon footprint for water quality and floor space. Footprint (length × width) matters more than height for a bottom-walking turtle — go long and wide, not tall. One turtle per tank is safest; musk turtles can be scrappy with each other.

Filtered water at 72–78°F (22–26°C) for adults; keep hatchlings and juveniles a touch warmer, around 78–80°F (26–27°C). Use a guarded aquarium heater and a thermometer — don't guess.

Deeper than pet-store lore claims. Musk turtles are poor swimmers and prefer to walk the bottom, so provide about 8–12 in (20–30 cm) of water for an adult, with plenty of submerged rocks, wood, and plants they can climb to reach the surface for air. Hatchlings start shallower with easy footholds; increase depth as they grow.

Strong, over-rated filtration is the heart of turtle keeping. Use a canister (or robust submersible) filter rated for roughly 2–3× the tank's water volume — turtles are messy carnivores. Pair it with weekly ~25–30% water changes and a test kit; a mild current is fine and often welcome.

A DRY, easily-climbed dock (flat stone, cork, or a commercial platform) that lets the turtle fully leave the water and dry off. Surface temperature under the basking lamp should read about 85–95°F (29–35°C) — aim for ~90°F. They bask less than sliders but absolutely still do it, so the dock is not optional.

Turn heat and lights off at night and let the room provide a natural drop. A cooler night in the mid-to-upper 60s°F (roughly 18–21°C) is fine and healthy; you only need supplemental night heat if your home gets genuinely cold. Water rarely swings much overnight, so no separate night heater is usually required.

A linear T5 HO UVB tube (e.g., Zoo Med ReptiSun 5.0 or Arcadia 6%) in a reflective fixture, spanning part of the enclosure over the basking dock. Mount it so the basking surface reads a UV Index (UVI) of about 3.0–4.0 (roughly 13–14 in / 33–36 cm above the dock, farther if there's mesh between). Run it 10–12 hours a day and replace the tube about every 12 months, as UVB output fades before the light does.

Optional. Bare-bottom is the easiest to keep spotless. If you want a naturalistic look, use fine sand or smooth river rock too large to swallow — avoid small/medium gravel, which musk turtles can ingest while foraging. A bioactive soil base under stone works for experienced keepers.

Offer a cuttlebone floating in the tank as a free-choice calcium source (replace every 1–2 months as it dissolves). With real UVB and a varied, pellet-based diet, heavy supplement dusting usually isn't needed; a light calcium (with D3) dusting on non-pellet foods a couple times a week is a reasonable extra for growing juveniles.

Small for an aquatic turtle: adults reach a carapace (shell) length of about 3–5 in (7.5–13 cm); a commonly cited large individual is around 5.4 in (13.7 cm). They stay this size for life — a tiny tank does not keep them tiny.

A long-term commitment: commonly 30–50 years in captivity with good care. The verified maximum on record is 54.8 years (AnAge). Wild individuals typically live far shorter (often 15–19 years).

See a reptile or exotics vet if you notice: Soft, pyramided, or misshapen shell, or a shell that flakes/pits abnormally — possible metabolic bone disease or shell infection; see an exotics vet.; Puffy, swollen, or shut eyes — often linked to vitamin A deficiency or infection; get it checked.; Open-mouth breathing, wheezing, bubbles/mucus from nose or mouth, or swimming lopsided/listing — possible respiratory infection; treat as urgent.; Refusing food for more than a week (once settled), sudden lethargy, or floating abnormally — book a vet visit.; White/fuzzy patches, red streaks, foul-smelling lesions on skin or shell — possible infection; see a vet.; Straining or unable to pass eggs (gravid females) — an emergency; go to an exotics vet promptly..