How big does Blue-green Chromis get?

Blue-green Chromis reaches an adult standard length of 6–9 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 Blue-green Chromis 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 Blue-green Chromis?

At least 120 L, and no shorter than 90 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 a schooling fish: keep at least 5 together. Fewer than that and it hides, loses colour, and aggression has nowhere to spread.

What is Blue-green Chromis like to keep?

Temperament: semi-aggressive. Difficulty: beginner. It occupies the top and is planktivore. Reef safety is "Reef safe".

Can Blue-green Chromis be kept with its most common tank mate?

The checker returns "Can be kept together". Blue-green Chromis and Firefish Goby is a well-established pairing. Individual fish still differ; the record says "usually fine", not "guaranteed".

G-01 / 47Marine

Blue-green Chromis蓝线雀

Chromis viridis · Pomacentridae

Pale blue-green damselfish that hovers in shoals above branching corals.

Illustration to come

G-01 / 47 · Blue-green Chromis Chromis viridis

SpecificationsFish atlas

Name: 蓝线雀
Scientific name: Chromis viridis
Family: Pomacentridae
Origin: Indo-Pacific coral reefs
Adult size: 6–9 cm
Temperament: Semi-aggressive
Diet: Planktivore
Water level: Top
Level: Beginner
School size: ≥ 5
Min. tank: 120 L
Min. length: 90 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

1In groups under five, subordinates get bullied into starvation.
2Shoal numbers commonly dwindle over time; no need to top up constantly.
3Planktivore: feed small pellets and frozen copepods.
4Reef safe and the most low-risk schooling fish for a coral tank.
5Needs open upper water and moderate flow; do not pack the tank with rock.

Check a tank mate

Jump straight to the verdict for Blue-green Chromis against this one — no need to pick it again.

Frequently asked questions

How big does Blue-green Chromis get?: Blue-green Chromis reaches an adult standard length of 6–9 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 Blue-green Chromis 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 Blue-green Chromis?: At least 120 L, and no shorter than 90 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 a schooling fish: keep at least 5 together. Fewer than that and it hides, loses colour, and aggression has nowhere to spread.
What is Blue-green Chromis like to keep?: Temperament: semi-aggressive. Difficulty: beginner. It occupies the top and is planktivore. Reef safety is "Reef safe".
Can Blue-green Chromis be kept with its most common tank mate?: The checker returns "Can be kept together". Blue-green Chromis and Firefish Goby is a well-established pairing. Individual fish still differ; the record says "usually fine", not "guaranteed".