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