The butterfly carp begins to grow a tail when it reaches thirty centimeters. When the butterfly carp grows to 30 centimeters, it is almost finalized. It is also at this time that the butterfly carp begins to drag its tail and its tail begins to grow, becoming more and more beautiful as it grows. Due to individual and environmental differences, the time for butterfly carp to grow its tail is not fixed, so you need to wait patiently.

Factors affecting the tail size of butterfly carp:

1. The size of butterfly carp’s tail is closely related to the breeding environment. The fish tank should be large enough and the water temperature should be kept at 25-35 degrees Celsius. Too high or low enough will not be conducive to the growth of their tails.

2. The size of butterfly carp’s tail is related to nutrition. Feed it on time every day. Don't be too full when feeding. It is enough to be eighty percent full. You need to feed it special butterfly carp feed, and you can also feed it some live bait with high protein content such as red worms.

3. The size of butterfly carp’s tail is related to water quality. The water quality needs to be clear and not turbid, and fish feed does not need to be put in too many times to avoid polluting the water quality.