Despite the name these are cerianthids, a separate group from true sea anemones. Each one lives inside a soft, felt-like tube of mucus and sand, cannot use light and depends on being fed, and it needs deep sand because rock gives it nowhere to live. Its tentacles sting neighbours and it can shed floating stingers that may hurt fish and corals, so anything it could reach is at risk. Not every tube anemone is tropical: some are cool-water animals, such as Pachycerianthus fimbriatus at about 15-20 °C (59-68 °F), which need a chiller, so confirm the species and origin before putting one in a reef tank. Reports differ on whether it eats fish, so treat small fish and shrimp near the sand as at risk.
Educational only. Some KinStation entries are reviewed by licensed veterinarians, but none can replace an in-person exam. Always consult a licensed veterinarian or board-certified specialist for diagnosis, treatment, or any decision affecting your pet's health.
Need expert help with your tube anemone?
Connect with a specialist near you or ask a licensed vet — never substitute online guidance for hands-on care in an emergency.
Soft body in a felt-like tube that often passes 15-18 cm (6-7 in) and can far outgrow the animal. Adult size depends on the species.
Lifespan
—
Social needs
solo
Native region
All oceans, from the shore to abyssal depths
Origin
Worldwide
Climate
Varied
Water type
Marine
Part of the Sea Anemones
Stinging, sessile cnidarians ranging from clownfish-hosting giants to nano-sized carpet species. Many are demanding, mobile, and can sting corals or be drawn into pumps — careful placement and rock-stable water are essential.
The key need is soft sand that goes deeper than the tube, with plenty of open space around it. Keep flow gentle to moderate, since strong current disturbs the soft bottom, and no special lighting is needed. Cerianthids burrow in soft sediment in every ocean, from the shore to the abyss. If the main tank cannot hold that depth, a sand-filled rock pocket, a refugium or a buried pot of sand can work.
Not every tube anemone is tropical. Some are cool-water animals, such as Pachycerianthus fimbriatus at about 15-20 °C (59-68 °F), which need a chiller, so confirm the species and origin before putting one in a reef tank.
For tropical animals keep stable reef water: SG about 1.025, 24-27 °C (75-81 °F), pH 8.1-8.4.
Substrate
Use fine sand or mud to a depth greater than the tube, and allow for a tube of 15-18 cm (6-7 in) or more. Sand depth decides success more than anything else here.
Equipment & setup
No special lighting is needed. Use gentle pumps or directed flow that brings food past the tentacles without stirring the sand, and long tongs or a feeding tube for target feeding.
Diet
Must be fed. They keep no zooxanthellae and do not use light. Brine shrimp, pellets and similar small meaty foods work well, placed where the long outer tentacles can take them. Sources give no firm schedule, so start at a few feeds a week and adjust to the animal's condition.
Behavior & temperament
In place of a sticky foot the lower end is a bulb made for burrowing, and a frightened animal drops its entire body down the tube instead of just folding its tentacles. There are two rings of tentacles: a long outer set for catching food and a short inner set beside the mouth. The tube itself is woven from threads fired by a kind of stinging cell found only in this group. An animal can leave its tube and settle somewhere new.
Health
Stings its neighbours. Its sting is milder than a true anemone's, yet the tentacles still carry stinging cells and the floating stingers it may release can hurt fish and corals, so leave nothing within reach. Reports differ on fish: one care article says tankmates should be too large for it to eat, while a venom study considered fish capture unlikely, so treat small fish and shrimp near the sand as at risk. Warm reef water can harm the cool-water species, so confirm what you have. It also cannot live on rock: without deep sand it has nowhere to burrow. With good footing in deep, fine sand it can live for decades.
Tips, DIY & hacks
Plan the sand bed before anything else. Not every tube anemone is tropical: some are cool-water animals, such as Pachycerianthus fimbriatus at about 15-20 °C (59-68 °F), which need a chiller, so confirm the species and origin before putting one in a reef tank. Keep it well clear of corals and fish it can reach, because it stings them and can release floating stingers. Reports differ on fish: one care article says tankmates should be too large for it to eat, while a venom study considered fish capture unlikely, so treat small fish and shrimp near the sand as at risk. Do not place it on rock. Trade pieces are rarely named to species, so treat the group name as the honest label.
KinStation
Aquatic
Compare
Need expert help with your tube anemone?
Ask a vet in the community
Varied
Marine