Sick Neon Tetra
I have 6 neons in my tank. In the past all have been prosperous. I notice one neon has gotten significantly smaller and has lost some of his color. He is still eating but does not look well at all.
Could it be old age? He is between 1 and 2 years old. All other neons and fish are fine. Water levels are consistently good. I do not have a hospital tank. Should I euthanize him? Should I watch his appetite and remove him if he stops eating?
Any advice is greatly appreciated.
55 Gal. Tank population:1 - 4" Red Tail Shark, 6 - Neons, 2 - Zebras, 2 - Spotted Corys, 1 Emerald Cory, 1 - Glass Catfish, 1 - Plecostemus, 1 Sun Fire Platy