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