Parrotfish will feel cold when the water temperature is below 20°C. Staying in a low-temperature environment for a long time will make them fall ill or even die. Parrotfish are tropical fish and have strict requirements for water temperature. The suitable water temperature range is from 20°C to 30°C, and the most suitable temperature is from 25°C to 28°C. When the water temperature is below 15°C, the luster of their scales will fade noticeably. They won't die in the short term, but an overly low temperature will make the fish prone to getting sick and will lead to death in the long run.
To ensure the health of parrotfish, breeders should keep the water temperature above 20°C and try to maintain it between 25°C and 28°C as much as possible. Besides, parrotfish need a relatively high level of dissolved oxygen, so the oxygen content in the aquarium must be sufficient.