Why is my Fromia starfish losing its legs?

Losing limbs or appearing to 'melt' is usually a sign of osmotic shock (caused by sudden changes in water chemistry during acclimatisation), severe starvation, or a bacterial infection. Unfortunately, this condition is very difficult to reverse once it begins.

How do I safely acclimatise a Fromia starfish?

You must use the drip acclimatisation method over a period of 2 to 3 hours to allow them to slowly adjust to your tank's salinity and pH. It is also crucial that they are never exposed to air during the transfer.

What do Fromia starfish eat?

They primarily feed on microscopic surface films, detritus, microalgae, and tiny sponges found on mature live rock. They rarely accept prepared foods, making a well-established aquarium essential.

Can I keep a Fromia starfish in a nano tank?

It is not recommended. Nano tanks generally lack the surface area of mature live rock necessary to sustain the starfish's constant grazing, which often leads to starvation.

Are Fromia starfish completely reef safe?

Yes, they are entirely reef safe. They will peacefully graze over live rock and coral bases without harming polyps, soft corals, or other sessile invertebrates.

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Fromia Starfish

Fromia spp.

Vibrant, reef-safe sea stars prized for their striking colours, but demanding highly mature aquariums to avoid starvation.

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Ideal Conditions

Temperature: 23 – 26 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 7 – 15 cm
Minimum volume for adequate live rock grazing: 150 litres+
Lifespan: 2 – 5 years
Diet: omnivore
Water flow: moderate
Preferred setup: Requires a highly mature reef aquarium with copious amounts of porous live rock to provide sufficient grazing surface. Sand or rubble substrate is also beneficial.

About the Fromia Starfish

The genus Fromia comprises some of the most visually stunning starfish available in the marine aquarium trade, including popular species like the Red Sea Star (Fromia milleporella) and the Marble Starfish (Fromia indica). These relatively small echinoderms are entirely reef-safe, traversing rocks and glass without harming corals or sessile invertebrates. However, their dietary needs make them delicate additions. Rather than active scavengers, they rely heavily on microscopic life found only in well-established systems.

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Is it right for your tank?

Check Fromia Starfish against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Fromia Starfish comes from

Native range

Indo-Pacific, Red Sea

Countries / regions

Australia, Indonesia, Fiji, Maldives, Philippines

Habitat

Coral reefs, rocky slopes, and lagoon rubble zones, typically found clinging to hard substrates.

Widely distributed across tropical Indo-Pacific reefs, with specific species often localised to certain regions.

Similar species

Blue Linckia Starfish
Linckia laevigata
Sand Sifting Starfish
Astropecten polyacanthus
Serpent Sea Star
Ophioderma spp.

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful reef fish that completely ignore bottom-dwelling invertebrates.
Great
Lawnmower Blenny
Salarias fasciatus
Shares grazing habits but occupies different physical niches without aggression.
Great
Blue-legged Hermit Crab
Clibanarius tricolor
Small hermit crabs are generally safe, but large or aggressive species may pick at the starfish's sensitive tissue.
Compatible with caution
Harlequin Shrimp
Hymenocera picta
Obligate starfish eaters that will quickly hunt and consume any Fromia species.
Not recommended
Dogface Puffer
Arothron nigropunctatus
Predatory species with strong beaks that routinely prey upon echinoderms and crustaceans.
Not recommended

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