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