Polychaete Worms

Marine aquarists setting up there tank with liverock to aid biological filtration will come across these polychaete worms by default as they are normally is attached to liverocks.
The Polychaeta or polychaetes are a class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called [...]