I have a dwarf male gaurami that I have had for 9 months or more. He has a dark grayish-looking smudge on the end of his dorsal fin. It was there when I got him, but I didn't see it until I put him in my 30 gallon tank. I looked from above, but it didn't stick out or look fuzzy or anything. It has grown, though the fish has not. He seems happy and is eating well. The tank has lots of plastic plants and rocks in it.
Does anyone know what this mark could be? Thanks.
Does anyone know what this mark could be? Thanks.