Pseudocheilinus tetrataenia

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Facts
Latin name Pseudocheilinus tetrataenia - Schultz, 1960
Local name Four-lined wrasse
Family Labridae - Pseudocheilinus
Origin Australia, Indonesia, East Pacific, Central/West Pacific
Max length 7 cm (2,8")
As aquarium fish
Minimum volume 150 cm (40 gal)
Hardiness Hardy
Suitable for aquarium Suitable with care
Reef safe Always reef safe
Aggressiveness Aggressive towards other species
Feed
Recommended Zooplankton (Cyclops, pods...)
Small crustaceans (Krill, mysis, artemia...)
Beware of
Jumps out of open aquaria

This species is known to jump out of open aquaria.

Threat towards crustaceans

This species poses a threat towards shrimps and crabs etc., which are relatively small.

Aggressive

This species can be extremely aggressive towards other fish.

Be careful when keeping these fish together with peaceful or docile species. Regular feeding, plenty of hiding places and a lot of space can alleviate aggressive behavior to some degree.

Keep in mind
Thrive best on their own

These fish flourish better without other members of the same species in the aquarium.

Frequent feeding

This fish requires feeding several times a day, especially when newly added.

When the fish can find its natural food in the aquarium it requires less frequent feeding. 

Hiding places

This species needs good hiding places, for example, between live rocks.

Hermaphroditic

This species can change gender from female to male.

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

Eats flatworm

This species is known to feed on flatworms.

One can, of course be unlucky in having a specimen that refuses to eat them.

Initially shy

This species can be very shy when first introduced into a new aquarium.

More aggressive fish can be introduced after this species has acclimatized.

Descriptions and further reading
Genus description (Pseudocheilinus)

Fish of the Psuedocheilinus are popular aqauarium fishes, as they are attractive and effective at keeping flatworm and pyramid snails at bay.

It is the Psuedeocheilinus hexataenia (Sixline Wrasse) one sees most in the trade. P. hexataenia can occasionally show extreme aggression towards other fish of the same size, in which case consider fish of the Halichoeres genus instead.
Eventhough these fish can be very aggressive, if they are hunted by larger, even more aggressive species, they will hide themselves.

They don´t dig themselves into the sand, but sleep between the rocks.

It is normally easy to feed them with different types of frost and flake foods. Some individuals like to eat small crustaceans, but this is usually not a problem.

Family description (Labridae)

Wrasses are nearly always seen in reef aquaria, since many of the species are both attractive and useful in battling a range of unwanted invertebrates like i.e. flatworms, pyramide snails.
These fish live of everything from zooplankton to large crustaceans, sea urchins and the like.

The needs and behaviour of Wrasses vary greatly, so it is vital to familiarize oneself with the specific species before buying one.

FishBase
Aquarium trade Yes
Distribution Pacific Ocean: Japan to the Hawaiian and Tuamoto islands, south to the Austral Islands.
Danish common names Firelinjet læbefisk
English common names Four-lined wrasse
References and further reading

About references

Henry C. Schultz. 2003. ...Four, Six, Eight, Who Do We Appreciate? Wrasses! Wrasses! The Genus Pseudocheilinus - Reefkeeping Magazine - (English)
Bob Fenner. Striped and Not: The Small, But Pugnacious Wrasses of the Genus Pseudocheilinus - Wet Web Media - (English)
Bob Fenner. 2011. Small, but Pugnacious: The Pseudocheilinus Wrasses - Tropical Fish Hobbyist Magazine - (English)

Scott W. Michael. 2009. Wrasses and Parrotfishes (Reef Fishes Series Book 5) - TFH Publications / Microcosm Ltd. - (English)