Yellow Sea Cucumber

Colochirus robustus

Saltwater Invertebrate Species Group: Cucumbers Family: Cucumariidae

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Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Yellow Sea Cucumber

General 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. Like other Sea Cucumbers, Colochirus robustus has the potential to poison an aquarium. The Sea Cucumber cannot tolerate high nitrate levels or copper-based medications.

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