White stuff on media ball

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HumbleAsianReefer

HumbleAsianReefer

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Hello guys. Anyone can tell me what this thing is?
8-9 months tank. But this media ball is transfered from my previous tank, age around 4years++ if not mistaken. I noticed this just a few days ago. Is it friend or foe? Thanks
IMG_6157.jpeg
IMG_6158.jpeg
 
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