Will a Tiger Tail Sea Cucumber poison my tank if it dies?

While they do contain mild toxins (holothurin) in their tissues, Holothuria hilla is considered one of the safest sea cucumbers for aquariums. If they die or eviscerate under stress, they rarely wipe out a tank, unlike the highly toxic Sea Apples, provided you run carbon and do a water change.

Why is my sea cucumber slowly shrinking?

Shrinking is the primary, visible symptom of starvation in sea cucumbers. They consume their own body mass to survive when the sand bed lacks sufficient organic detritus. Ensure your tank is large enough and the sand bed is mature.

Can I keep a Tiger Tail in a bare-bottom aquarium?

No. They strictly require a fine sand bed to feed. Without sand to ingest and process for detritus, they will quickly starve to death.

How deep should the sand bed be for a sea cucumber?

A fine sand depth of at least 3 to 5 centimetres is recommended to provide a sufficient foraging surface area and allow enough organic buildup to sustain them.

Why did my sea cucumber suddenly split in half?

Tiger Tail Sea Cucumbers can reproduce asexually through a process called transverse fission. They may split when conditions are ideal, or occasionally in response to certain stressors, effectively creating two independent cucumbers.

MarineMarineIntermediate

Tiger Tail Sea Cucumber

Holothuria hilla

The Tiger Tail Sea Cucumber is a highly effective, peaceful sand sifter that naturally cleans the substrate of mature marine aquariums.

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Ideal Conditions

Temperature: 23 – 27 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 15 – 25 cm
200L minimum for sufficient sand bed: 200 litres+
Lifespan: 3 – 5 years
Diet: Detritivore
Water flow: Moderate
Preferred setup: Requires a deep, mature sand bed (at least 5cm) with porous live rock for shelter.

About the Tiger Tail Sea Cucumber

Recognised for its distinctive yellow and brown banded appearance, the Tiger Tail Sea Cucumber (Holothuria hilla) is a staple of the marine clean-up crew. As it slowly moves across the aquarium floor, it ingests sand to extract detritus and uneaten food, excreting clean, pelletised sand behind it. This continuous turning of the substrate prevents the buildup of harmful anoxic zones. Unlike some of its more toxic relatives, the Tiger Tail is considered relatively safe for reef tanks, rarely eviscerating unless severely stressed.

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Where Tiger Tail Sea Cucumber comes from

Native range

Indo-Pacific, Red Sea, Great Barrier Reef

Countries / regions

Australia, Indonesia, Fiji, Philippines

Habitat

Sandy lagoons and shallow reef flats, often sheltering under coral rubble.

Widely distributed across tropical Indo-Pacific reefs.

Similar species

Black Sea Cucumber
Holothuria atra
Edible Sea Cucumber
Holothuria edulis
Donkey Dung Sea Cucumber
Holothuria mexicana

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful, water-column dwelling fish that completely ignore bottom-dwelling invertebrates.
Great
Turbo Snail
Turbo spp.
Peaceful algae grazers that share the cleanup crew duties without competing for sand-bed detritus.
Great
Emerald Crab
Mithraculus sculptus
Opportunistic scavengers with claws; large individuals might pick at the fleshy skin of the cucumber.
Compatible with caution
Clown Triggerfish
Balistoides conspicillum
Aggressive predators that naturally crush and consume slow-moving invertebrates.
Not recommended
Dogface Puffer
Arothron nigropunctatus
Pufferfish actively hunt invertebrates and will readily bite chunks out of a defenceless sea cucumber.
Not recommended

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