Hawaiian Feather Dusters are known to reproduce in the aquarium I have not witnessed this first hand, just read about it... I have a bunch of the small white ones from the Gulf, and they seem to spawn by secreting little balls of sperm or something like it out into the water column... then in about 10 to 20 days, I start seeing new ones pop up where they weren't before...
They also expell their waste through the mouth...
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