Orange Starfish

Introduction

The Orange Starfish is a stunning marine invertebrate appreciated for its vivid orange coloration and unique five-armed symmetry. It adds a pop of color and intrigue to saltwater aquariums while playing a subtle role in the ecosystem as a scavenger.

Scientific Name

Fromia monilis or Fromia sp. (commonly associated species)

Common Name

• Orange Starfish

• Orange Sea Star

• Tile Sea Star (in some regions)

Water Quality and Temperature

• Temperature: 22°C – 28°C (72°F – 82°F)

• pH: 8.1 – 8.4

• Salinity: 1.023 – 1.025

• Ammonia/Nitrite: 0

• Nitrate: <20 ppm

• Requires stable, pristine water quality

Feeding

• Omnivorous scavenger

• Feeds on:

  • Biofilm

  • Detritus

  • Algae on rocks and glass

  • May accept finely chopped meaty marine foods (rarely)

• Supplement feeding may be necessary in low-nutrient tanks

Tank Mates

• Peaceful reef-safe species

• Compatible with:

  • Clownfish

  • Gobies

  • Tangs

  • Reef invertebrates

• Avoid with aggressive or predatory fish and puffers

Substrates and Tank Decorations

• Fine sand or crushed coral substrate

• Live rock is essential for grazing and biofilm

• Avoid sharp or abrasive decorations

Suitable Plants

• Does not interact with marine plants

• Macroalgae such as Chaetomorpha or Halimeda may be present in the tank

Sexing

• No visible sexual dimorphism

• Reproduction involves external fertilization in the wild

Breeding

• Rarely, if ever, bred in captivity

• Wild reproduction includes broadcast spawning

Maximum Size and Longevity

• Size: Up to 15 cm (6 inches)

• Lifespan: 5–10 years with excellent care

General Information

The Orange Starfish is a peaceful and slow-moving bottom-dweller. It is sensitive to changes in salinity and temperature, making slow acclimation critical. Not suitable for new tanks as it relies on mature biofilm and microflora to feed.

A Fun Fact

Orange Starfish can regenerate lost arms! If one is damaged, it may regrow over time—some species can even regenerate a full body from a single limb under the right conditions.