I went out of town for two nights and when I came home I noticed this large dark patch on the back half of this fish. Do you think its bacterial infection, an injury, or something else?
I tested water parameters and everything comes back normal. Fish is still swimming and eating well. They are a small juvenile about 2.75 inches. 180 gallon tank.
I tested water parameters and everything comes back normal. Fish is still swimming and eating well. They are a small juvenile about 2.75 inches. 180 gallon tank.