To heal a broken fish fin, you can add as much as 5 drops of methyl blue to the aquarium. After that, feed the hippopotamus mosquito larvae.
Remember to change the aquarium water regularly. Aquarium water significantly affects the growth of new fins in fish.
After the aquarium water has been changed, give the pond salt and add dried ketapang leaves.
You don't need to worry, after the steps above are done, slowly the fins of the Crowntail Betta fish will grow and return to their original state. 😁