the brand is just called "fungus cure" they are brown capsules and they turn the water a lime green which will be gone when you replace the carbon. water conditions are usually the cause and it is usually the nitrates, if not treated it can turn into pop eye, which basically costs them the loss of an eye. if your water is fine then it is a true fungus. i treated both my tanks i treated him in my qt tank and then i also treated my show tank with one dose, so half of the regular dose for my qt tank good luck with it. you can get it at petsmart and it is only like 3.99