Scarus psittacus

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Facts
Latin name Scarus psittacus - Forsskål, 1775
Local name Common parrotfish
Family Scaridae - Scarus
Origin East Indian Ocean, West Indian Ocean, Australia, Japan, The Red Sea, Indonesia, New Zealand, Central/West Pacific
Max length 30 cm (11,8")
As aquarium fish
Minimum volume 2000 cm (528 gal)
Hardiness Average
Suitable for aquarium Suitable with care
Reef safe Unknown
Aggressiveness Peaceful
Feed
Recommended Microalgea (Eg. spirulina)
Macroalgea (Eg. seaweed / nori)
Maybee Large polyp stone coral (LPS)
Small polyp stone coral (SPS)
Beware of
Demand a very large aquarium when fully grown

This species needs a very large aquarium when fully grown.

Exactly how big the aquarium should be is hard to say, but the size of this species is such, that it cannot normally be kept in a home aquarium.

Keep in mind
Heavy load

This species eats a great deal and demands an aquarium that can tolerate such a heavy load.

Personality

This species often has a fun and interesting personality.

Requires plenty of space for swimming.

This species revels in swimming and requires an aquarium with ample space.

Hermaphroditic

This species can change gender from female to male.

When a male is needed, a female changes sex and takes on the role.

Effective algae-eaters

This species can eat large amounts of algae (relative to their size) from rocks, like green hair algae and filamentous algae.

As it doesn’t eat every algae type, in case of a specific algae plague, find out more precise information.

Descriptions and further reading
Family description (Scaridae)

Parrotfish (Scaridae) are effective algae eaters for the reef, but some species will also live off rock corals.
Many of these fish will grow too big for most domestic aquaria, although there are some exceptions.

Parrotfish will generally eat a lot and often, which must be taken into account.
It is an advantage to have lots of algae in the aquarium which they can graze on. 

These fish will sleep in a mucus cocoon between stones. 

The species most often seen in tanks is Scarus quoyi, which is suitable for coral aquaria. It does have a large appetite, so the aquarium must have good filtration. 

FishBase
Aquarium trade Yes
Distribution Indo-Pacific: Red Sea south to Sodwana Bay, South Africa (Ref. 5490) and east to the Hawaiian, Marquesan, and Tuamoto islands, north to southern Japan, south to Shark Bay, Western Australia and Lord Howe Island.
English common names Rosy-cheek parrotfish
Common parrotfish
Palenose parrotfish
Palenosed parrot
Batavian parrotfish
French common names Perroquet prairie
References and further reading

About references

Bob Fenner. Parrotfishes, Family Scaridae - Wet Web Media - (English)
Scott W. Michael. 2009. Wrasses and Parrotfishes (Reef Fishes Series Book 5) - TFH Publications / Microcosm Ltd. - (English)
Joshua Wiegert. Parrotfish: Good or Bad for the Hobby? - Tropical Fish Hobbyist - (English)