I have a beautiful blue crown tail who I've ha for about 5 months now. He was living in a 2.5 gallon unfiltered unheated tank for the first month, now he lives in a 6.6g fluval chi, filtered and heated. I also have 5 small tank mates with him and 3 ghost shrimp.
For about two months now (this started before I added the other fish, but the shrimp were there) I have been worried about his caudal fin. I noticed that it was visibly shorter than his anal and dorsal fins, but there does not appear to w any signs of fin rot. To be safe I dosed with Betta Fix for a week and saw no change.
He is very happy and always builds me beautiful bubble nests, so it's really only a cosmetic concern right now. Could his anal and dorsal fins just be growing faster than his caudal and that's why the difference?
I couldn't get a good pic of him, but imagine on this picture the caudal fin stops shortly after the dark blue ends