How to prevent mold from growing on wood?

I have this piece of wood, unsure what type, some kind of driftwood? That I want to use in a project, but it was/ will be in a high humidity area with water sprays in a snake tank. There already is some black and white mold growing on it, and tips on how to clean it and stop mold from further growing on it? I can't use anything chemical cause of the snake, I was thinking of sanding off the moldy areas but I'm worried more will develop. It's a nice piece of wood so I'd like be be able to save it and keep using it! Thanks.