I'd guess a sea cucumber of some sort, but I'm bad at such guesses. I've moved the thread to the "other invertebrates" forum, for more views, and I left a pointer in NTTH.
GerritM is right .
It is a seamouse.
I just found one recently while transferring my 14g biocube livestock into a new 29g cube.The rock was 5 years old and never saw it till that day.
here is a link to my thread when I tried to ID mine.
Kingfisher - Yours was an Aphrodita or a related species but Sansupt's isn't. It really is a sea cucumber. Notice how the long appendages (which are extensions of the body) are on all the body surfaces and there's no segmentation. Aphroditids have bristles along the sides & long hairs only on the top; the body is segmented but smooth.
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