How to Care for Crabs
  • 1. What is the ideal salinity level for most crab tanks?
A) 0.990-1.000 specific gravity
B) 1.030-1.040 specific gravity
C) 1.020-1.026 specific gravity
D) Freshwater
  • 2. What is the best substrate depth for burrowing crabs?
A) Equal to the height of the smallest crab
B) One inch
C) At least twice the height of the largest crab
D) Does not matter, they don't burrow
  • 3. What should the humidity level be in a crab tank?
A) 90-100%
B) 50-60%
C) 20-30%
D) 70-80%
  • 4. What is the ideal temperature range for a crab tank?
A) 70-80°F
B) 80-90°F
C) 60-70°F
D) 50-60°F
  • 5. What should you NOT use to dechlorinate water for crabs?
A) Dechlorinator that removes chloramine
B) Dechlorinator that removes chlorine
C) Dechlorinator specifically made for aquariums
D) Human-grade dechlorinator
  • 6. What is a crucial element to provide for crabs when they molt?
A) Calcium
B) Potassium
C) Magnesium
D) Phosphorus
  • 7. What type of shell should you provide for hermit crabs?
A) Only shells that are the exact same size as their current shell.
B) Only shells that are smaller than their current shell.
C) A variety of sizes and shapes, larger than their current shell.
D) No shells, they grow their own.
  • 8. How often should you clean a crab tank?
A) Spot clean daily, deep clean every few months.
B) Never, it is a self-sustaining ecosystem.
C) Clean weekly
D) Clean monthly
  • 9. What is a sign that a crab is stressed?
A) Lethargy and lack of appetite
B) Excessive shell changing
C) Vibrant coloration
D) Constant digging
  • 10. What is the best type of water to provide for crabs?
A) Distilled water
B) Dechlorinated saltwater and dechlorinated freshwater
C) Only dechlorinated freshwater
D) Tap water
  • 11. What is a good source of protein for crabs?
A) Lettuce
B) Cucumbers
C) Carrots
D) Dried shrimp
  • 12. What is a common problem caused by low humidity?
A) Excessive digging
B) Increased appetite
C) Shell aggression
D) Difficulty molting
  • 13. What should you do if a crab is buried and molting?
A) Move it to a separate container.
B) Sprinkle extra calcium on the substrate.
C) Leave it undisturbed.
D) Dig it up to check on it.
  • 14. What should you NEVER feed crabs?
A) Vegetables
B) Fruits
C) Nuts
D) Processed foods with preservatives
  • 15. What type of lighting is recommended for crab tanks?
A) No lighting is needed
B) Direct sunlight
C) Indirect natural light or low-level artificial light.
D) High-intensity UV lighting
  • 16. Why is it important to provide multiple crabs with extra shells?
A) It's not important as long as they have one shell each.
B) To make the tank look more aesthetically pleasing.
C) To prevent shell fighting and ensure they have appropriate sizes.
D) To give them something to do.
  • 17. What is the function of the uropods on a hermit crab?
A) To help them swim.
B) To grip the inside of their shell.
C) To sense vibrations.
D) To defend themselves.
  • 18. How do crabs breathe?
A) Lungs
B) Skin
C) Spiracles
D) Gills
  • 19. What is a good way to increase humidity in a crab tank?
A) Misting the tank regularly
B) Removing the water dishes
C) Adding a fan to the tank
D) Decreasing the substrate depth
  • 20. Why is it important to remove uneaten food from the crab tank?
A) To save money on food.
B) To ensure the crabs don't overeat.
C) To prevent bacterial growth and foul odors.
D) The crabs will eat it later.
  • 21. What do crabs typically do when they're getting ready to molt?
A) Become lethargic and bury themselves
B) Become more active and social
C) Change shells frequently
D) Eat excessively
  • 22. What is a good treat for land hermit crabs?
A) Chocolate
B) Dog food
C) Cat food
D) Unsweetened shredded coconut
  • 23. What is a quarantine tank used for?
A) Growing plants for the crabs
B) Isolate new or sick crabs
C) Main display tank
D) Breeding tank
  • 24. How can you tell a crab is nearing the end of its molt?
A) Its exoskeleton becomes soft and pliable.
B) It becomes more active
C) It starts eating more
D) Its colors become dull
  • 25. What might indicate shell aggression in hermit crabs?
A) Crabs burying themselves
B) Crabs eating from the same food bowl
C) One crab persistently bothering or attempting to evict another crab.
D) Crabs sleeping near each other
  • 26. What is a good substrate to avoid for crabs?
A) Eco earth
B) Pine or cedar shavings
C) Coconut fiber
D) Play sand
  • 27. What is a common mistake people make when caring for crabs?
A) Cleaning the tank too often
B) Not providing enough shell options
C) Providing too much water
D) Providing too much food
  • 28. What should you do with a crab's old exoskeleton?
A) Leave it in the tank for the crabs to eat and regain nutrients.
B) Throw it away immediately.
C) Use it as decoration.
D) Feed it to other pets.
  • 29. How can you avoid flooding the crab tank when misting?
A) Mist heavily once a day.
B) Add a drainage layer to the bottom of the tank
C) Mist lightly and frequently, avoiding direct saturation of the substrate.
D) Never mist, rely only on water dishes.
  • 30. What's a sign of a healthy crab?
A) Hiding constantly
B) Dragging its shell
C) Sitting still for extended periods
D) Active and responsive to its environment
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