got some zoas and for some reason developed a light coat of the brown algae on them. did some research and found that it could be a fungus infection and the recommended method is to use Furan-2, which contains Furazolidone. Well, i can't find Furan-2 or pure Furazolidone anywhere within driving distance and may have to order online. But in the meantime, i found myself some API product with furazolidone along with other active ingredients. is it safe to use?
