How big does Ocellaris Clownfish get?

Ocellaris Clownfish reaches an adult standard length of 7–9 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 Ocellaris Clownfish 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 Ocellaris Clownfish?

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 Ocellaris Clownfish like to keep?

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

Can Ocellaris Clownfish be kept with its most common tank mate?

The checker returns "Can be kept together". Ocellaris Clownfish and Royal Gramma is a well-established pairing. Individual fish still differ; the record says "usually fine", not "guaranteed".

G-01 / 44Marine

Ocellaris Clownfish公子小丑

Amphiprion ocellaris · Pomacentridae

Orange with three white bands; the classic first marine fish, widely captive-bred.

Illustration to come

G-01 / 44 · Ocellaris Clownfish Amphiprion ocellaris

SpecificationsFish atlas

Name: 公子小丑
Scientific name: Amphiprion ocellaris
Family: Pomacentridae
Origin: Indo-Pacific coral reefs
Adult size: 7–9 cm
Temperament: Semi-aggressive
Diet: Omnivore
Water level: Middle
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

1Quarantine new arrivals for two to four weeks; clowns commonly carry ich and Brooklynella.
2Captive-bred specimens take pellets readily; wean wild ones with brine and mysis first.
3An anemone is optional; when present the pair defends it as territory.
4Keep a single pair in small tanks; extra fish become a dominant female plus suppressed subordinates.
5Reef safe and the easiest clown for a coral tank, though it claims a small territory.

Check a tank mate

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

Frequently asked questions

How big does Ocellaris Clownfish get?: Ocellaris Clownfish reaches an adult standard length of 7–9 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 Ocellaris Clownfish 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 Ocellaris Clownfish?: 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 Ocellaris Clownfish like to keep?: Temperament: semi-aggressive. Difficulty: beginner. It occupies the middle and is omnivore. Reef safety is "Reef safe".
Can Ocellaris Clownfish be kept with its most common tank mate?: The checker returns "Can be kept together". Ocellaris Clownfish and Royal Gramma is a well-established pairing. Individual fish still differ; the record says "usually fine", not "guaranteed".