feather duster excreting white stuff

I have seen feather dusters do this when stressed (by moving or some rapid change in the tank). Once the stressor was removed, they stopped and were perfectly healthy.
 
It's a defense mechanism, I wouldn't be worried.
Or you could give your little guy props for finally getting off :p
 
More than likely stress has forced a spawning event. (not defense but survival mechanism) You typically need to supplement small tanks like that with Phyto to keep feather dusters healthy
 
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