...Among the head-shaped goldfish, there is a kind of goldfish called "Chrysanthemum Head" on the recent goldfish website, which means that the head is extremely huge, and the top is even larger than the base. This kind of goldfish has It is normal and is one of the species of goldfish. However, when the explosion you mentioned occurs, you must consider whether it is caused by an external collision. If not, then don’t worry about it. It is the normal ecological condition of goldfish. But I I feel that a head that is too enlarged and loose is undesirable. It can easily cause head problems and sometimes affect the goldfish’s sight. It also loses the tightness of the head required by lion-headed goldfish. This is not desirable. The above is just my personal opinion. Opinions are for reference only.