White Fuzz Growing In Hob Filter

Colleen B

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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?
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kallililly1973

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Is it possibly a calcium buildup or the filter cartridge starting to fall apart? You could tell her to take the cartridge n swish it in a bucket of tank water and take a couple paper towels and wipe the filter down with some tank water as well
 

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