Hi,
I’ve had this candy cane tetra for about a month now. He’s in a 15 gal tank with a guppy; there were originally more fish but they all died :’( . Anyway, I’m not sure if its eye has always flat been like that on the one side, but we’ll just say that it was like that from the time that I got him. This morning I noticed he had this weird little clear bubble on his eye. Does anyone know what this is??