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