Noticed my betta fish has split ends in his ventral fin on one side over 2 months ago. Put in Indian almond leaves a month ago and it doesn't seem to be getting better. It is only on 1 fin, no other parts of the body. 20 gallon heated tank with lots of plants and just the betta fish. His appetite is still amazing.
Nitrate: 0-10, has never been above that range
Nitrite, Ammonia: 0
Water temp: 81 degrees
Sorry for the fuzzy photos. He swims around too much!