When parrotfish are sleeping, their heads will lean slightly forward and somewhat downward. They will choose an area where the water flow is still, stop swimming, and only their fins and gills will open and close slowly. In addition, the body color of parrotfish will turn slightly white during sleep, because their body color will become lighter when they are in a relaxed state and will gradually return to normal after they wake up.
When sleeping, parrotfish will also spin a set of "sleeping clothes" to surround themselves. They will spin silk in the crevices of corals or reefs to enclose themselves, and they will bite through the thin membrane when they become active the next day. This behavior not only helps them stay safe during sleep but also prevents them from being discovered by predators.
The sleeping environment of parrotfish has a significant impact on their sleep quality. They need an area with still water flow, and the water temperature should be maintained between 25-28°C, and the water quality conditions also need to be stable. If the water temperature is too low or the water quality is unstable, parrotfish may exhibit problems such as lying still and sinking to the bottom. Therefore, when keeping parrotfish, special attention needs to be paid to these environmental factors to ensure that they can rest healthily.