Yes and is loosing colorLooks bacterial to me (the tail you mean)?
6 months. Tank is cycle. 55 gallonsHow long have you had the fish?
How long has the main tank been set up? Is it cycled?
All looks fine. I use primeWhat kind of test kit do you have? What are your readings for ammonia, nitrIte, and nitrAte?
What type of water conditioner do you use?
All looks fine. I use prime