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For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]
Giant Danios are a tropical fish species and require a tanks water temperature to be at least 70 - 80 degrees F. Their lifespan is on average 5-7 years in captivity, and the ideal pH level is anywhere from 6.0 to 8.0.
The tank sizes can vary widely depending on the needs of the particular species, and the temperature is usually in the tropical range of 76-82 °F. The substrate can vary from sand to gravel, but many aquarists choose crushed coral or aragonite sand, both of which help raise the hardness and pH to an acceptable level.
Most freshwater aquarium fish do well in water that is soft to moderately hard, and that has a pH between 6 and 8. Brackish water aquaria are a special case and need dedicated community tanks. While a few freshwater and marine fish can adapt to brackish water, most cannot.
A low pH will lead to high levels of dissolved carbon dioxide (CO 2), which can prove toxic to fish. [12] pH can also be controlled by degassing CO 2 in a packed column or with an aerator, this is necessary in intensive systems especially where oxygenation instead of aeration is used in tanks to maintain O 2 levels. [13]
A pH controller is recommended to control the CO2. It works by connecting to the CO2 regulator on the CO2 tank and measuring the pH of the solution inside the reactor via a pH probe. The controller will turn on and off the flow of CO2 based on the pH inside the reactor. The pH range for the typical calcium reactor is 6.5–6.8.