So I have had my crown tail for roughly a month now and I have him housed in a 10g tank with 3 Neons and a small (2in) bottom dwelling catfish. He was always very active and would swim up and down the tank endlessly. Now however, he becoming less active and I have noticed that his fins are becoming shorter. I have only once seen him chase after his tail. Theres a heater, filter (which isn't too strong) and everything (living condition wise) seems to be fine. I also have real plants and a moss ball so there shouldn't be anything he is tearing his fins on. He also isn't a very hearty eater (but he never was). :/
Let me know what you think!! Thank you so much for your time!!!! :))
P.S. Ever since I got him he has had a black/ dark blue lining around his pink fins.