Adding to a Brand-New Tank

Black Sea Cucumbers require algae and biofilm to graze. Sterile tanks may not provide enough food initially.

Keeping Them in Bare-Bottom Tanks

Without access to sand and substrate, Black Sea Cucumbers cannot feed naturally and may slowly starve.

Ignoring Pump and Overflow Protection

Sea cucumbers can be injured if they enter powerheads or overflow systems, potentially leading to water quality issues.

Is the Black Sea Cucumber good for cleaning reef tank sand beds?

Yes. Black Sea Cucumbers are excellent natural sand cleaners that continuously process substrate, consuming detritus, bacteria, biofilm, and organic waste while leaving behind cleaner, aerated sand.

What does a Black Sea Cucumber eat in a marine aquarium?

Black Sea Cucumbers feed on organic matter found within the substrate, including detritus, bacteria, microalgae, biofilm, and microscopic organisms. They rely heavily on mature sand beds for their nutrition.

Can a Black Sea Cucumber starve in a reef tank?

Yes. In aquariums with limited substrate, very low nutrient levels, or insufficient detritus production, food sources may become depleted over time. Larger mature systems generally provide the best long-term success.

Why is my Black Sea Cucumber leaving piles of sand behind?

This is completely normal. As the cucumber processes sand for food, it expels clean, processed substrate from the opposite end of its body. These sand castings are often a sign of a healthy, actively feeding specimen.

Is the Black Sea Cucumber reef safe with corals and fish?

Yes. Black Sea Cucumbers are considered reef safe and do not consume corals, fish, anemones, or other desirable reef livestock.

Why is my Black Sea Cucumber climbing the glass?

Occasional glass climbing is normal and may occur while the cucumber searches for food-rich areas or explores the aquarium. Persistent climbing can sometimes indicate a lack of food within the substrate or changing environmental conditions.

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Aquamarine Aquaristic

Black Sea Cucumber (Holothuria atra)

Name: Black Sea Cucumber (Holothuria atra)
Brand: Aquamarine Aquaristic
SKU: 47495542964470
Price: 24.5 AUD
Availability: OutOfStock

$24.50 ~~$35.00~~ Save $10.50 each

Out of stock

Black Sea Cucumber (Holothuria atra) Description The Black Sea Cucumber is a hardy and highly beneficial detritivore commonly found throughout Indo-Pacific reef flats and lagoons. Recognised by its smooth black...

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Description

Black Sea Cucumber (Holothuria atra) Description

The Black Sea Cucumber is a hardy and highly beneficial detritivore commonly found throughout Indo-Pacific reef flats and lagoons. Recognised by its smooth black body and slow-moving nature, this species plays an important role in maintaining healthy reef ecosystems by consuming organic waste and recycling nutrients. In the aquarium, Black Sea Cucumbers continuously process sand and substrate, helping to reduce detritus accumulation while promoting a cleaner, healthier sand bed. Their peaceful temperament and reef-safe nature make them an excellent addition to mature marine aquariums with established substrates.

Shipping To Tasmania	YES
Shipping To Western Australia	NO

Husbandry

Care guide

Care difficulty

BeginnerModerateExpert

Moderate

Temperament

SkittishPeacefulSemi-agg.Aggressive

Peaceful

Maximum size 40cm

0 cm 15 cm 30 cm

Recommended Stocking

200 litres

Reef safe

Yes

Diet

Detritivore – Black Sea Cucumbers feed by ingesting sand and extracting organic detritus, biofilm, bacteria, microalgae, and microscopic organisms trapped within the substrate. As they process the sand, they help recycle nutrients and improve substrate cleanliness. Mature aquariums with established sand beds provide the best long-term food source.

Avoid these pitfalls

Common mistakes to avoid

Learn from these common pitfalls when caring for marine livestock.

Black Sea Cucumbers require algae and biofilm to graze. Sterile tanks may not provide enough food initially.
Without access to sand and substrate, Black Sea Cucumbers cannot feed naturally and may slowly starve.
Sea cucumbers can be injured if they enter powerheads or overflow systems, potentially leading to water quality issues.

Help centre

Frequently asked questions

Find answers to common questions about our products and shipping.

Yes. Black Sea Cucumbers are excellent natural sand cleaners that continuously process substrate, consuming detritus, bacteria, biofilm, and organic waste while leaving behind cleaner, aerated sand.
Black Sea Cucumbers feed on organic matter found within the substrate, including detritus, bacteria, microalgae, biofilm, and microscopic organisms. They rely heavily on mature sand beds for their nutrition.
Yes. In aquariums with limited substrate, very low nutrient levels, or insufficient detritus production, food sources may become depleted over time. Larger mature systems generally provide the best long-term success.
This is completely normal. As the cucumber processes sand for food, it expels clean, processed substrate from the opposite end of its body. These sand castings are often a sign of a healthy, actively feeding specimen.
Yes. Black Sea Cucumbers are considered reef safe and do not consume corals, fish, anemones, or other desirable reef livestock.
Occasional glass climbing is normal and may occur while the cucumber searches for food-rich areas or explores the aquarium. Persistent climbing can sometimes indicate a lack of food within the substrate or changing environmental conditions.