SeafanEmergencies

Brittle star

Green brittle star

Ophiarachna incrassata

Green brittle star (Ophiarachna incrassata)
Photo: Neıl, CC BY-SA 3.0, via Wikimedia Commons
Group
Brittle star
Care level
Intermediate
With corals
Reef safe with caution

What does the green brittle star do in a reef tank?

Scavenger that also ambushes small fish and shrimp typical, check

With corals: Corals yes; small fish no

How many should you keep?

One US gallon is 3.785 litres and one UK gallon is 4.546 litres, so a "per gallon" rule depends on whose gallon it means.

What can go wrong?

Known fish predator; some keepers say well-fed ones hunt less typical, check

Which tankmates are risky?

Fish

Fish that may eat or harass it.

Take care (4)

  • Neon gobyThe green brittle star can catch small fish like the neon goby.
  • Yellow clown gobyThe green brittle star can catch small fish like the yellow clown goby.
  • Hi-fin red banded gobyThe green brittle star can catch small fish like the hi-fin red banded goby.
  • Yellow assessorThe green brittle star can catch small fish like the yellow assessor.

Other invertebrates

Invertebrates it may harm, or that may harm it.

None known.

These checks follow the reasons fish and invertebrates clash: same species or genus, similar shape, mouth size, temperament, food, burrows, tank size and the order they are added. Individual animals differ; every source agrees on that.

Sources

  1. Reef Builders green brittle star, 2015Read 21 October 2026, search summary only.

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