The term cognition is often incorrectly used to mean cognitive abilities or cognitive skills..
The best water temperature for betta fish is around 74-78 Fahrenheit, or 23-25 Celsius. Your betta will generally be fine if the water temperature is slightly out of this range (72-80 F), but 74-78 is what their natural habitat of rice paddies in Thailand and other southeast asian countries contains.lightly warmer water temperature for Betta fish (80-82 F) can be used if your betta is sick and needs to be quarantined or separated from other fish while he is being treated with medication.
Tank size is important. When adding fish to your betta tank, please remember an important general rule: your tank should have one gallon of water per inch of fish. If you have a five-gallon tank, you can have up to five one-inch-long fish in it for optimal living conditions.