20 Questions
Which country is the largest supplier of tropical freshwater fish in the ornamental fish trade?
Singapore
What is the main source of coldwater fish like Koi carp?
Japan
Which two countries are the main sources of tropical marine fish in the ornamental fish trade?
Indonesia and the Philippines
Which type of fish is stenothermic and prefers temperatures between 82-88°F?
Discuss
What is the recommended wattage of UV-light per litre of water in a tropical fish tank?
0.5 watts
How long does it typically take for denitrifying bacteria to colonize biological filters in a new tank set-up?
6-8 weeks
During the process of breeding Koi carp, when are the females injected for the second time?
24 hours after the first injection
What is added to the eggs and milt to reduce the stickiness of the eggs?
Saline and urea
In marine tanks, what is the recommended stocking level in relation to the volume of water?
1cm of fish per 3.5 litres of water
Which of the following is the best method to measure water hardness?
Using a colorimetric photometer
Which of the following is NOT a standard water quality test to be assessed?
Calcium levels
Which of the following pH levels is suitable for marine fish?
pH 8-10
Which type of filter is prone to disruption by bottom feeding fish and can be inefficient in large tanks?
Gravel filters
Which type of filter is ideal for larger tanks but can be expensive in terms of start-up costs and maintenance?
Power filters
Which type of filter is used to suspend particles of sand in a column of water, increasing the surface area available for denitrifying bacteria to attach to?
Sand filters
Which of the following factors can cause a decrease in oxygen carrying capacity of water?
All of the above
At what level of oxygen concentration does anoxia occur?
4mg/L
What problem may occur in fish if there is too much oxygen in the water?
Gas bubble disease
Which of the following is NOT a factor that can reduce oxygen levels in water?
None of the above
What is the minimum level of oxygen concentration required for healthy fish?
6mg/L
Test your knowledge about freshwater aquarium tanks and learn about the different types of filters used, including the benefits and challenges associated with each. Explore the importance of maintaining a healthy biological filter and how it can be affected by in-water medications.
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