1. Reason: Parrot fish may die one by one because the water temperature is too low. They are tropical fish and like higher water temperature. If they live in low water temperature, they will get sick. If they are not treated in time after illness, they will gradually die.

2. Solution: Breeders need to use heating rods to raise the water temperature above 28 ℃. And keep the water temperature constant to avoid discomfort caused by too large temperature difference.

1. Reason: The death of parrot fish one by one may also be caused by poor water quality, and parrot fish pollutes the water quality seriously. If the breeder can't change the water for them in time, bacteria will easily breed in the water, which will lead to their death.

2. Solution: The breeder needs to change the water for parrot fish immediately to ensure that the water quality is clean and refreshing. If conditions permit, it is best to install a circulating filtration system to slow down the deterioration of water quality.

1. Reason: The death of parrot fish one by one may be that the food fed is unclean or toxic, and they are gluttonous. If the food fed is toxic, they will gradually die.

2. Solution: Breeders need to change food immediately to prevent them from being poisoned again. And raise the water temperature to 30 ℃, speeding up their metabolism.

1. Reason: The death of parrot fish one by one may also be caused by illness, and their ability to resist diseases is relatively poor. Once fish in the fish tank are sick, it may be transmitted to other fish.

2. Solution: Breeders need to observe carefully and isolate and treat sick fish immediately. It is best to sterilize regularly to reduce the chance of illness.