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SESK: Stuff Everyone Should Know · sesk.info/reptile-turtle-tank-size-myth

If you keep a pet turtle in a small tank, will it stay small?

No. Turtles do not stay small in small containers.

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  1. Yes, it grows to fit the tank
  2. No, it does not stay small ✔
  3. Only if you feed it less

Why: It is a myth that turtles grow only to fit their tank. Merck says they do not remain small in a small container, and fishbowl-type tanks are not good enough for turtles of any age or size.

Huh, didn't know that: Merck says many turtle species grow quickly and are quite messy, even if they are adorable as hatchlings.

The dad joke
Why did the turtle hire a moving van? It finally outgrew its apartment.
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References

Answer: No, it does not stay small. It is a myth that turtles grow only to fit their tank. Merck says they do not remain small in a small container, and fishbowl-type tanks are not good enough for turtles of any age or size.

  1. Selecting a Reptile (Merck Veterinary Manual, pet owner version) www.merckvetmanual.com/all-other-pets/reptiles/selecting-a-reptile
    They do not remain small if kept in a small container. Small fishbowl-type tanks are not adequate for housing turtles
    Checked 2026-10-11.

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