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