Feed it different food.And if that doesn't work than that is how your goldfish was born.
Household mold remover.
That is actually Excriment. It is him using the toilet.
My dogs favorite treat is goldfish.
"Goldfish" colors range from white to yellow-orange to blue to black. White goldfish have no pigment cells.
no
trichoderma
You can kill mold with bleach. You should wear a mask so the mold spores don't get into your nose or mouth.
Depending on what your sick goldfish has, it will either be specific to that fish, which you should place in a separate tank to treat, or it's something that will spread to other fish in your tank, in which case you will need to treat them all.
Not a goldfish anymore.
usually not but it depends on the type of goldfish
It is albino.
The best way to treat black mold between walls is to call a professional, as they will be able to treat all the mold, even where it is not easily visible or accessible. You can try to treat it yourself by using mold remover spray and then repairing any leaks that may be allowing water into the space. Just note that if the mold isn't completely eradicated, and the leaks/moisture eliminated, the mold can return and spread again.
Cheese has white spots on it because it is made by mold. The mold is normally left on the cheese.