Originally Posted by wystearya
Halfmoon Bettas are prone to getting holes and rips in their fins. The fins are very fragile, and they can get torn just from flaring. He should be fine as long as the water is clean. He will heal in time.
I agree i think it can be it.
No behavior change right?
Somehow it not doesn't look like tail biting to me. I do have tail bitter, but looks different. It C shape when he bites it. May be i am wrong.
Doesn't look like fin rot either.
Also you i think you wrote that you doing 25%-75% water changes every 2 days for 2.5 gall tank? Are you the one who wrote that he get stressed with 100% water changes?
Because for 2.5 gall i would do 50% and 100% water changes a week. Definitely not 25%.
Or if he stressed with 100% water changes do 50% and 75% water changes.
I would also syphon the gravel regularly since you don't do 100% water changes.