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My sister is a teacher and has a small 5 gallon fresh water tank in her classroom. She sent me these pictures. There is a white fuzz growing on her filter and I've never dealt with this in any of my tanks before so I have no idea what to tell her. What do you think this is? How should she get rid of it? If its mold, is it safe for it to be in the room with a bunch of toddlers?