Not sure what this is

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Hi there just checking this is growing in my brother tank is this a problem and spreading ?

image.jpg
 
If you mean the white little worm-like shapes with feathers at the end, they look like feather-duster worms.

They're harmless but must be a quiet tank....
 
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Fan worms, filter feeders.

angels amongst other fish, will eat them quickly, only leaving the few that the fish cannot reach. Nice for a sump area.
 
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