Scarus spinus

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Facts
Latin name Scarus spinus - (Kner, 1868)
Local name Greensnout parrotfish
Family Scaridae - Scarus
Origin East Indian Ocean, Australia, Indonesia, East Pacific, Central/West Pacific
Max length 30 cm (11,8")
As aquarium fish
Minimum volume 800 cm (211 gal)
Hardiness Hardy
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)
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.

Any number of specimens

This species can function in large numbers down to just one.

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.

Algae Eaters

Even though these fish enjoy a diverse type of frozen foods, it is imperative that its primary food, is algae based, thus ensuring that the fish`s immune system remains healthy.

This can, for example, be plant based fish flakes, Nori seaweed or similar.

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
Distribution Pacific Ocean: Christmas Island in the eastern Indian Ocean (Ref. 30874), then from the Philippines to Samoa, north to the Ryukyu Islands, south to the southern Great Barrier Reef.
English common names Spiny parrotfish
Yellowhead parrotfish
Yellow-head parrotfish
Greensnout parrotfish
Pygmy parrotfish
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)