Invertebrates

June 2, 2025

Invertebrates:

Sea Urchin

(Echinoidea)

Nature’s lawnmower, sea urchins keep algae in check with their razor-sharp spines and Aristotle’s Lantern (a unique chewing structure). Some species are venomous, while others are harvested for their roe (uni).

Nature’s lawnmower, sea urchins keep algae in check with their razor-sharp spines and Aristotle’s Lantern (a unique chewing structure). Some species are venomous, while others are harvested for their roe (uni).

Care & Compatibility

Sizes Available

Habitat

Sea Urchins are found in various marine environments worldwide, from shallow tide pools to deep ocean floors. They inhabit rocky reefs, sandy bottoms, and coral formations, playing crucial roles in controlling algae growth.

Diet

Primarily herbivorous, Sea Urchins are excellent algae grazers that help control algae growth in aquariums. They feed on various types of marine algae, coralline algae, and organic detritus.

Physical Characteristics
  • Size varies by species: 5-15 cm diameter
  • Spherical body covered in moveable spines
  • Various colors including black, purple, red, and green
  • Tube feet for movement and feeding
  • Mouth located on the underside
Aquarium Requirements
  • Minimum tank size: 100 liters
  • Water temperature: 22-26°C
  • pH: 8.1-8.4
  • Excellent for algae control
  • Handle with care due to sharp spines

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Emperor Angelfish

Koran Angelfish