How to Care for Danios - Exam
  • 1. What is the minimum tank size recommended for a small school of Danios?
A) 5 gallons
B) 20 gallons
C) 2.5 gallons
D) 10 gallons
  • 2. Danios are generally considered what type of fish?
A) Aggressive fish
B) Brackish fish
C) Community fish
D) Solitary fish
  • 3. What is the ideal temperature range for Danios?
A) 78-82°F (26-28°C)
B) 80-85°F (27-29°C)
C) 68-78°F (20-26°C)
D) 60-65°F (15-18°C)
  • 4. What type of water hardness do Danios prefer?
A) Soft to moderately hard
B) Extremely soft
C) Very hard
D) Brackish
  • 5. What is the ideal pH range for Danios?
A) 7.6-8.0
B) 8.0-9.0
C) 6.5-7.5
D) 5.0-6.0
  • 6. Danios are known for being what type of swimmers?
A) Bottom dwellers
B) Active swimmers
C) Stationary swimmers
D) Slow swimmers
  • 7. How often should you perform water changes in a Danio tank?
A) Only when the water is dirty
B) Monthly
C) Every other week
D) Weekly
  • 8. What percentage of water should you change during a water change?
A) 5%
B) 10-20%
C) 75-100%
D) 25-50%
  • 9. What type of filtration is important for Danios?
A) Good biological filtration
B) No filtration needed
C) Only chemical filtration
D) Only mechanical filtration
  • 10. What type of food do Danios primarily eat?
A) Omnivore
B) Carnivore
C) Piscivore
D) Herbivore
  • 11. What is a common sign of stress in Danios?
A) Increased activity
B) Brightened colors
C) Increased appetite
D) Loss of color
  • 12. How many Danios should you keep in a group?
A) At least 6
B) Just one
C) 3-4
D) 1-2
  • 13. What is a common disease that affects Danios?
A) Fin rot
B) Dropsy
C) Swim bladder disease
D) Ich
  • 14. What is the best way to treat Ich in Danios?
A) Do nothing, it will go away on its own
B) Lower the temperature
C) Raise the temperature and use medication
D) Add salt only
  • 15. What type of plants are suitable for a Danio tank?
A) Delicate, slow-growing plants
B) Plants that require high lighting
C) Brackish water plants
D) Hardy, fast-growing plants
  • 16. Which of these tankmates is NOT a good choice for Danios?
A) Corydoras Catfish
B) Tetras
C) Guppies
D) Aggressive Cichlids
  • 17. What is the approximate lifespan of a Danio in captivity?
A) 6-8 years
B) 3-5 years
C) 10+ years
D) 1-2 years
  • 18. What is a good way to encourage breeding in Danios?
A) Add salt to the water
B) Separate the males and females permanently
C) Lower the water level and add spawning mops
D) Raise the water level significantly
  • 19. Danio eggs are...
A) Carried by the female
B) Laid in nests
C) Laid in a single, large clump
D) Scattered and adhesive
  • 20. What should you feed Danio fry?
A) Brine shrimp (adult)
B) Flake food
C) Infusoria or liquid fry food
D) Bloodworms
  • 21. What is the function of a sponge filter in a Danio tank?
A) Only mechanical filtration
B) Only chemical filtration
C) To heat the water
D) Biological and mechanical filtration
  • 22. Why is it important to cycle a new aquarium before adding Danios?
A) To dechlorinate the water
B) To establish beneficial bacteria
C) To lower the pH
D) To make the water look clearer
  • 23. What does the nitrogen cycle do?
A) Converts oxygen to carbon dioxide
B) Converts ammonia to nitrite to nitrate
C) Converts chlorine to chloramine
D) Converts nitrate to nitrite to ammonia
  • 24. What is the maximum size Danios typically grow to?
A) 1 inch
B) 2-2.5 inches
C) 6 inches
D) 4 inches
  • 25. Which of the following is a sign of overfeeding Danios?
A) Rapid growth
B) Increased activity
C) Brightened coloration
D) Uneaten food on the bottom of the tank
  • 26. What is the purpose of a quarantine tank?
A) To breed fish
B) To house aggressive fish
C) To observe new fish for disease
D) To grow plants
  • 27. What type of lighting is best for Danios?
A) Moderate lighting
B) Very bright lighting
C) UVB lighting
D) No lighting
  • 28. How often should you clean the substrate in a Danio tank?
A) Daily
B) During water changes
C) Only when it looks dirty
D) Never
  • 29. What does 'acclimating' a fish mean?
A) Gradually adjusting the fish to the new tank's water parameters
B) Feeding the fish extra food
C) Giving the fish medication
D) Changing the water in the bag the fish came in
  • 30. Why are Danios often recommended for beginner fishkeepers?
A) They require very little care
B) They are very expensive
C) They are very aggressive
D) They are hardy and adaptable
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