Are Yellowtail Damselfish aggressive?

They are considered semi-aggressive. While they are significantly less belligerent than most other damselfish species, they will still fiercely defend their chosen territory, especially in smaller aquariums.

Can I keep multiple Yellowtail Damsels together?

Yes, but with caution. In smaller tanks (under 150 litres), they are best kept singly to avoid bullying. In larger tanks, keeping an odd-numbered group of three or five can help disperse conspecific aggression.

Will they eat my corals or shrimp?

No, they are completely reef-safe. They will ignore your corals, anemones, and ornamental invertebrates like cleaner shrimp and snails.

How can I stop my damselfish from bullying new fish?

It is best to add damselfish as the very last fish in your community so they cannot claim the entire tank as their territory. If you must add fish later, rearranging the rockwork slightly before introduction can help break up established territories.

Do they need a large tank?

A single Yellowtail Blue Damselfish can comfortably live in an aquarium as small as 75 litres, making them an excellent candidate for marine nano tanks.

MarineMarineBeginner

Yellowtail Blue Damselfish

Chrysiptera parasema

The Yellowtail Blue Damselfish is a striking, hardy, and vibrant marine fish, famous for its intense electric blue body and contrasting bright yellow tail.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 14 – 22 dGH
Salinity: 1.02 – 1.026 SG
Adult size: 5 – 7 cm
minimum: 75 litres+
Lifespan: 4 – 6 years
Diet: Omnivore
Water flow: moderate
Preferred setup: Live rock with plenty of crevices and hiding spaces for territorial establishment.

About the Yellowtail Blue Damselfish

Arguably one of the most popular starter fish in the marine hobby, the Yellowtail Blue Damselfish boasts incredible resilience and brilliant colouration. It is a fantastic ambassador for the Pomacentridae family, providing the classic visual impact of a damselfish without the extreme aggression seen in some of its close relatives. Their small adult size and active swimming style make them a highly engaging addition to both nano tanks and sprawling reef aquariums alike.

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Is it right for your tank?

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

Where Yellowtail Blue Damselfish comes from

Native range

Indo-West Pacific

Countries / regions

Philippines, Indonesia, Solomon Islands, Papua New Guinea

Habitat

Sheltered coral reefs and coral-rich lagoons with dense Acropora growth.

Most heavily concentrated in the Coral Triangle.

Similar species

Azure Damselfish
Chrysiptera hemicyanea
Springer's Damselfish
Chrysiptera springeri
Fiji Blue Devil Damselfish
Chrysiptera taupou

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

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

View all compatibility

Ocellaris Clownfish
Amphiprion ocellaris
Both are hardy, occupy different primary areas, and are robust enough to handle minor territorial squabbles.
Great
Coral Beauty Angelfish
Centropyge bispinosa
Dwarf angelfish are active and confident enough not to be intimidated by a damselfish.
Great
Skunk Cleaner Shrimp
Lysmata amboinensis
The damselfish is completely reef-safe and will not bother ornamental shrimp or other marine invertebrates.
Great
Firefish
Nemateleotris magnifica
Timid gobies and dartfish may be bullied or out-competed for food by the boisterous damselfish in smaller aquariums.
Compatible with caution
Blue-green Chromis
Chromis viridis
Being in the same family, there is a risk of territorial dispute if tank space is limited.
Compatible with caution
Volitan Lionfish
Pterois volitans
Lionfish are predatory and will swallow small damselfish whole once they reach an adequate size.
Not recommended
Lined Seahorse
Hippocampus erectus
Seahorses are slow feeders and require a tranquil environment; the active damselfish will out-compete them for food and cause stress.
Not recommended

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