Hello everyone! I have a beautiful betta named Alpha who I've had for about 3.5 months now. When I bought him, his tail was very full and beautiful, but over the past 3 weeks or so, his tail appears to be receding and has a tattered appearance (before and after pictures attached). Alpha is a very active fish and has shown no other signs of duress or illness. His fins are also just fine, it seems to be just his tail that is receding. He lives in a 5 gallon tank with a heater and filter and plenty of hiding spots and foliage. He also has two "betta Buddy" plants. I perform strip tests roughly once every two weeks and have never seen any alarming readings. I do a 25% water change 1-2 times a week and use a turkey baster as a pseudo-gravel vacuum to clean up waste. I'm trying to figure out whether or not my little guy has tail rot or is maybe just biting his tail...and how to treat him to make his tail healthy again. Thank you!