After you buy the fish, don't put it into fresh water, although fresh water can live for a period of time, but for the sake of its health, it is better to use semi-saline water. Take care to sterilize it before you put it in, and after that, change the water regularly and cultivate some algae so that it can feed on it. It is worth mentioning that since it has the ability to bounce, it is best to have a cover on the tank and a higher water level in case it jumps out.