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How to Care for Discus Fishes - Exam
Contributed by: Sandhu
  • 1. What is the ideal water temperature for Discus?
A) 68-72°F (20-22°C)
B) 72-76°F (22-24°C)
C) 82-86°F (28-30°C)
D) 88-92°F (31-33°C)
  • 2. What is the recommended pH level for Discus?
A) 5.0-6.0
B) 6.0-7.0
C) 7.5-8.5
D) 8.0-9.0
  • 3. How often should you perform water changes for Discus?
A) Every other day
B) Once a month
C) 2-3 times per week
D) Once a week
  • 4. What percentage of water should be changed during water changes?
A) 75-90%
B) 100%
C) 25-50%
D) 10-20%
  • 5. What type of filtration is best for Discus?
A) Undergravel filter
B) Sponge filter, canister filter
C) No filtration
D) Hang-on-back filter only
  • 6. What is a common food for Discus?
A) Goldfish flakes
B) Bread
C) Lettuce
D) Beefheart mix
  • 7. What is a sign of stress in Discus?
A) Bright coloration
B) Darkened coloration
C) Aggressive behavior
D) Constant eating
  • 8. What is a common disease affecting Discus?
A) Fin Rot
B) Ich (White Spot Disease)
C) Hexamita (Hole-in-the-head)
D) Dropsy
  • 9. What is the minimum tank size for a group of Discus?
A) 75 gallons
B) 20 gallons
C) 10 gallons
D) 40 gallons
  • 10. How many Discus should be kept together?
A) 3
B) 2
C) At least 5-6
D) 1
  • 11. What type of lighting is best for Discus?
A) Black lights
B) Dim or subdued lighting
C) Bright, intense lighting
D) No lighting
  • 12. What type of substrate is recommended?
A) Large gravel
B) Fine sand or bare bottom
C) Sharp rocks
D) Crushed coral
  • 13. What should you do before adding new Discus to an established tank?
A) Float the bag for 5 minutes
B) Mix the water quickly
C) Quarantine them
D) Immediately add them
  • 14. What is the benefit of adding driftwood to a Discus tank?
A) Makes the water harder
B) Provides food
C) Raises pH
D) Releases tannins, lowering pH
  • 15. What is the ideal TDS (Total Dissolved Solids) level for Discus?
A) 0 ppm
B) 50-200 ppm
C) Above 1000 ppm
D) 500-1000 ppm
  • 16. What is the optimal age to start breeding Discus?
A) 3 years
B) 2 years
C) 6 months
D) 12-18 months
  • 17. How long does it take for Discus eggs to hatch?
A) 24 hours
B) 1 month
C) 1 week
D) Approximately 60 hours
  • 18. What do Discus fry feed on initially?
A) Bloodworms
B) Parent's slime coat
C) Flake food
D) Baby brine shrimp
  • 19. Why is good water quality crucial for Discus?
A) Makes them grow faster
B) Prevents disease and stress
C) Increases their lifespan exponentially
D) Has no effect on their health
  • 20. Which of these fish are NOT good tankmates for Discus?
A) Corydoras
B) Cardinal tetras
C) Pencilfish
D) Aggressive cichlids
  • 21. What is the scientific name of the Discus fish?
A) Poecilia reticulata
B) Betta splendens
C) Symphysodon spp.
D) Carassius auratus
  • 22. What does 'Hexamita' cause in Discus?
A) Ich
B) Hole in the Head disease
C) Dropsy
D) Fin Rot
  • 23. Why is a cycled tank important for Discus?
A) Removes harmful ammonia and nitrites
B) Increases oxygen levels
C) Makes the water clearer
D) Adds beneficial chemicals
  • 24. What can high nitrate levels cause in Discus?
A) Stress and susceptibility to disease
B) Brighter colors
C) Increased appetite
D) Faster growth
  • 25. Which food is NOT suitable for adult Discus?
A) Granules
B) Beefheart
C) Vegetable flakes only
D) Bloodworms
  • 26. How can you acclimatize new Discus to your tank?
A) Mix half the bag water with the tank water and release
B) Float the bag for 1 hour
C) Drip acclimation
D) Pour them in directly
  • 27. What is a sign of good health in Discus?
A) Lethargy and hiding
B) Rapid breathing
C) Clamped fins
D) Active swimming and eating
  • 28. What is the role of tannins in a Discus tank?
A) Increase pH
B) Lower pH and create a natural environment
C) Remove nitrates
D) Add oxygen
  • 29. What should you do if your Discus develops hole-in-the-head disease?
A) Treat with metronidazole
B) Increase water temperature
C) Add salt to the tank
D) Ignore it, it will heal on its own
  • 30. What is the purpose of a quarantine tank?
A) To grow plants
B) To observe new fish for disease
C) To store extra equipment
D) To breed fish
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