red centerpede like creature

[kappa]

OKay, there is something in my fuge.

Here is my riddle. What is a centermeter in size, red, has many leg-like apendages on the both sides like a centepede, and can swim very fast through the water.

[Kogut]

I'd say bristleworm, but they don't swim... They kinda spaz out... And then hut your hand... Not sure...