Chelmonops truncatus

Download Reef App on Google Play or App Store
Get it on Google Play Get it on App Store
Facts
Latin name Chelmonops truncatus
Local name Eastern talma
Family Chaetodontidae - Chelmonops
Origin Australia, Central/West Pacific
Max length 22 cm (8,7")
As aquarium fish
Minimum volume 500 cm (132 gal)
Hardiness Average
Suitable for aquarium Suitable for special aquariums
Reef safe Not reef safe
Aggressiveness Docile but might be aggressive towards similar species
Feed
Recommended Zooplankton (Cyclops, pods...)
Small crustaceans (Krill, mysis, artemia...)
Larger crustaceans (Shrimp, crabs...)
Other invertebrates
Maybee Soft coral
Large polyp stone coral (LPS)
Beware of
Eats tubeworms

This species likes to eat tubeworms.

Can nibble at clams

This species sometimes nibbles at clams including Tridacna species.

Cool water

This species lives in water colder than is the norm for a marine aquarium.

The temperature should be between 19 and 25 °C (66 and 77 °F).

Keep in mind
Requires a varied diet

This species must be fed with an appropriately varied diet.

Live food

There is a greater chance of success with this species if one can supply a living feed to allow it to adapt to the tank.

Well established aquarium with pods

This species thrives best when there is a sufficiently large amount of micro life (copepods, amphipods or similar) in the aquarium, so that the it can always find their own food.

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. 

Fastidious feeder

These fish eat exceptionally slowly and can be very selective feeders.

It can therefore be problematic to provide it with a sufficient and varied diet, in an aquarium with other, faster feeding species.

Docile

This species is very shy and docile, so one should be careful when keeping it with more aggressive fish.

Refuses to eat at first

This species can refuse to eat when newly introduced.
Normally however, they begin to eat within about a week, but it's advantageous if they can find their own food in the aquarium.

Descriptions and further reading
Genus description (Chelmonops)

The two species in the Chelmonops genus resemble each other, but C. curiosus has extended dorsal and anal fins.

Family description (Chaetodontidae)

The Butterflyfish are known for their attractive patterns and colours. They are closely related to Angelfishs, but can always be distinguished, as they lack the spines on each side of the head of the Angelfish.

A smaller group of these fish will seek out primairily soft corals, like Zoanthus. A larger part of the species will target different types of LPS corals. Butterflyfish are also known to seek out anemones, tubeworms and bristleworms.

Therefore it is important to choose the correct species in relation to the corals wanted, if one desires to keep Butterflyfish in a coral-aquarium.
Bristleworms, tubeworms and other small invertebrates are also a part of the diet for many Butterflyfish.

It can be problematic, with many of these species, to get them eating in the beginning, but many of the species cannot resist live zooplankton or live mussels with crushed shells. Another option is to mimic their natural behaviour by stuffing their food into coral skeletons or stones.

They ignore most other fish and are generally peaceful, therefore multiple Butterflyfish will have no problem living together. One should however be cautious about keeping similar species together unless they are a couple.

As these fish can be difficult to acclimatize and get feeding, it is important to buy healthy fish, to avoid having to deal with more problems. Make sure to check that they do not have parasites or any visible infections.

There are some species that should not be kept in an a aquarium, as they are food specialists and will almost always refuse to eat replacement foods. It can be possible to breed some species, which will eat frozen foods. Otherwise the only way to keep food specialists is by feeding them their natural diet, which consists of live SPS or LPS corals for example.

References and further reading

About references

Scott W. Michael. 2004. Angelfishes and Butterflyfishes (Reef Fishes Series Book 3) TFH Publications / Microcosm Ltd. - (English)
Bob Fenner. Butterflyfishes; Separating the Good Ones and Those You Don't Want - Wet Web Media - (English)
Collection of links to additional information - Wet Web Media - (English)
Tea Yi Kai. 2014. Reef Nuggets 2: Aquatic Lepidopterans for your reef (Revised edition) - Reef Builders - (English)