HI,
I am a goldfish owner and have been for 3 yrs now. My goldfish has never done this before but is hiding in the bottom corner. He goes back to the same corner. He will swim around and eat during feeding time. He is in a 29 gallon tank with himself and a algea eater. I have had to treat him before for cloud eye. Which was about 4 months ago. It has cleared up and has no symptoms of it returning. I don't notice any spots or white patches on him. his fins look a little frailed. I am thinking to treat him with a fungus and bacterial medication. Do you think this is the right choice?