Two years ago - My daughter won a goldfish & she still takes care of him - he's the loneliest creature around, but he's alive & I found that it's important to have greens. One time he got some kind of white crud growing like leprosy - & I gave him chlorella in his tank, since we don't have fresh green plants in there. It did the trick & cured him. I recommend chlorella for humans too. It's powerfully good. Eat your greens!