How big does Yellowtail Damselfish get?

Yellowtail Damselfish reaches an adult standard length of 6–8 cm (excluding the caudal fin). Size the tank for that, not for the juvenile you bring home — the difference is often several times over, and upgrading later costs more than buying once.

What water does Yellowtail Damselfish need?

24–27 °C, pH 8.1–8.4, 7–12 dGH, 7–9 dKH, specific gravity 1.023–1.026. That is only 3 °C wide, so stability matters more than hitting a particular number.

What is the smallest tank for Yellowtail Damselfish?

At least 60 L, and no shorter than 60 cm. That is the floor for long-term keeping, not for short-term survival: volume buys water stability and length buys swimming room, and neither substitutes for the other. It is not a schooling fish, so a single specimen or a pair is fine.

What is Yellowtail Damselfish like to keep?

Temperament: aggressive. Difficulty: beginner. It occupies the all levels and is omnivore. Reef safety is "Reef safe".

Can Yellowtail Damselfish be kept with its most common tank mate?

The checker returns "Not recommended together". Yellowtail Damselfish and Firefish Goby is a recorded conflict in this atlas. Predation, territorial fighting or conspecific aggression is the usual outcome, and a bigger tank does not change it.

G-01 / 48Marine

Yellowtail Damselfish黄尾蓝魔

Chrysiptera parasema · Pomacentridae

Royal blue with a bright yellow tail; bulletproof for a new tank but bossy later.

Illustration to come

G-01 / 48 · Yellowtail Damselfish Chrysiptera parasema

SpecificationsFish atlas

Name: 黄尾蓝魔
Scientific name: Chrysiptera parasema
Family: Pomacentridae
Origin: Indo-Pacific coral reefs
Adult size: 6–8 cm
Temperament: Aggressive
Diet: Omnivore
Water level: All levels
Level: Beginner
Min. tank: 60 L
Min. length: 60 cm
Reef safe: Reef safe

Water requirementsMarine

Temp.24–27 °C

pH8.1–8.4

Salinity1.023–1.026 SG

Alkalinity7–9 dKH

Units: temperature in °C, hardness in German degrees (dGH / dKH), marine salinity as specific gravity at 25 °C, volume in litres. These are the values recorded for the species and do not follow the site unit switcher.

Keeping notes

1Extremely hardy and often used to cycle, but do not abuse it as a test animal.
2Adults defend territory and harass peaceful later additions such as firefish.
3If mixing, add it late and use rockwork to break sight lines.
4Does not damage corals, but picks at small crustaceans on live rock.
5Omnivore leaning herbivore; pellets plus occasional algae sheets.

Check a tank mate

Jump straight to the verdict for Yellowtail Damselfish against this one — no need to pick it again.

Frequently asked questions

How big does Yellowtail Damselfish get?: Yellowtail Damselfish reaches an adult standard length of 6–8 cm (excluding the caudal fin). Size the tank for that, not for the juvenile you bring home — the difference is often several times over, and upgrading later costs more than buying once.
What water does Yellowtail Damselfish need?: 24–27 °C, pH 8.1–8.4, 7–12 dGH, 7–9 dKH, specific gravity 1.023–1.026. That is only 3 °C wide, so stability matters more than hitting a particular number.
What is the smallest tank for Yellowtail Damselfish?: At least 60 L, and no shorter than 60 cm. That is the floor for long-term keeping, not for short-term survival: volume buys water stability and length buys swimming room, and neither substitutes for the other. It is not a schooling fish, so a single specimen or a pair is fine.
What is Yellowtail Damselfish like to keep?: Temperament: aggressive. Difficulty: beginner. It occupies the all levels and is omnivore. Reef safety is "Reef safe".
Can Yellowtail Damselfish be kept with its most common tank mate?: The checker returns "Not recommended together". Yellowtail Damselfish and Firefish Goby is a recorded conflict in this atlas. Predation, territorial fighting or conspecific aggression is the usual outcome, and a bigger tank does not change it.