This thing is super tiny so the picture isnt the greatest. But basically it has these long tentacle things that look like branches (aren't completely straight, a little spikey) and it moves its arms towards its hole (mouth) feeding itself im assuming. It's behavior reminds me of some sort of anenome, or is it coral? I thought it may be a feather duster at first but when I saw it feeding itself with its arms I ruled that out. Thanks! i included a video as well.