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Christmas tree worm (Spirobranchus giganteus)
AI illustration, not an ID reference

Christmas tree worm

Spirobranchus giganteus

InvertebratesSaltwater

Care level
Demanding
Temperament
Peaceful
Reef safe
Yes
Recommended tank
100 L
Maximum size
3 cm
Temperature
24–27 °C
pH
8–8.4
Diet
Planktivore

Care at a glance

The Christmas tree worm bores into living stony coral and extends two spiral crowns of tentacles that look like tiny fir trees. At any movement they snap back into the rock in a fraction of a second.

What you buy is therefore not a loose worm but a piece of coral with worms in it; that coral colony has to stay alive, or the worms will die too. That makes it a species for a mature reef tank with good lighting, stable parameters, flow and regular fine plankton or filter feed.

Good to know

  • Filter feeder — needs fine suspended food

Related species

Keep Christmas tree worm in the BlubHub app

Add this species to your inhabitants, with count and photos, and see the care info next to your own water values, target bands and reminders. Free, no account, everything on your own device.

More about the app

Values are mainstream hobbyist guidance, not gospel — always watch what your own animals need.