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