Originally Posted by shellieca
What size tank & what is your water change schedule? Is the tank heated? If it happened suddenly I would lean towards damage from either a plant, decoration or filter intake if the tank is filtered. If its fin rot, clean water & time is the best medicine. If its damaged same thing clean water & time.
It's a 5 gallon and I am doing 50% changes twice a week. It is heated and the temp fluctuates 78-80 degrees. I didn't know about the cycling process when I got him so do you think it could be from that? And since I am trying to cycle the tank, would it hurt if I did a 100% water change? I just noticed this today, so hopefully it is just from a decoration or something and not a disease or something :(