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