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Sea Cucumber, Yellow EXPERT ONLY
Please Note: Due to variations within species, your item may not look identical to the image provided. Approximate size range may also vary between individual specimen.
Sea Cucumber, Yellow EXPERT ONLY (Colochirus robustus)
Additional locales and sizes may be available!

Quick Stats

Care Level Expert Only
Temperament Peaceful
Color Form Yellow
Diet Filter Feeder
Reef Compatible Yes
Water Conditions 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Venomous Poisonous When Stressed or Dies
Origin Indian Ocean, Western Pacific
Family Cucumariidae
Supplements Calcium, Magnesium, Strontium, Iodine, Trace Elements
Waterflow Medium
What do these Quick Stats mean? Click here for more information


The Yellow Sea Cucumber which originates from the Indian Ocean is very striking in appearance. They are bright yellow in coloration and have an elongated body with spikey projections. When feeding, the Yellow Sea Cucumber extends their branchy feeding arms into the current. These are beautiful filter feeders for an established reef aquarium.

The Yellow Sea Cucumber requires live rock to provide the nutrients it needs to sustain its health. It will usually find a location with moderate to strong current. It is a filter-feeding cucumber and similar in nature to the Sea Apple.

If a small group is kept, spawning in the home aquarium is possible. They may also reproduce by dividing into 2 individuals. This may come about due to stress, or may be a sign of good health.

The diet of a Yellow Sea Cucumber should include liquid or dried phyto and zoo plankton. They will also benefit from the substrate being stirred regularly releasing bacteria and detritus into the water. When malnourished, they will shrink in size, and may lose feeding arms. If these signs are noticed, increase the number of feedings, and target the cucumber with the appropriate food.

Like other Sea Cucumbers, Colochirus robustus has the potential to poison an aquarium. The chances of this happening are very rare unless the animal is accidentally sucked into an uncovered pump intake or overflow boxes.

Be sure to acclimate properly and house with appropriate inhabitants. The drip-acclimation method is recommended to minimize exposure to fluctuating water parameters. The Sea Cucumber cannot tolerate high nitrate levels or copper-based medications. Approximate Purchase Size: Small: 1/2" to 1-1/4" Medium: 1-1/4" to 2"

Caution: This species secretes or releases toxins when stressed or injured that may kill fish in the aquarium. cannot accept responsibility for any loss that may occur should this animal poison the aquarium.

Please note: We guarantee that ALL aquaria species we offer will arrive alive and in good condition. However, because of the increased level of care required for this particular species, it has been designated as "Expert Only." This species is recommended only for the expert aquarist, zoo, or research institution. “Expert Only” aquatic life is exempt from our extended guarantee after their arrival.

Customer Testimonials

David DeLugo Albany , NY

I purchased this species a few weeks ago and it is a colorful addition to my reef tank. The cucumber is housed with a pair of Percula Clowns, two shrimp, two starfish, an anemone, a pair of Mandarin Gobies, an anemone crab, and some corals. The tank has been up for 6 months and is going great. I perform water changes weekly, which is probably why I have had no problems with this cucumber. At first, my banded coral shrimp thought his filter feeding tentacles were food but after a few failed attempts he left him alone. The cucumber moves throughout the tank mainly staying on live rock. Once he finds a good current to sweep he will not move for two or three days. I feed him every other day with phyto plankton and keep the temp at 78°F. I would recommend this species to others due to its colors - you can't miss him! It has been a thrill watching this animal in my reef tank.
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