SeafanEmergencies

Chromis and damsels

Humbug damsel

Dascyllus aruanus

Also sold as Three stripe damsel, Whitetail dascyllus

Not for beginners

Humbug damsel (Dascyllus aruanus), photographed in the sea or an aquarium
Photo: Rickard Zerpe, CC BY 2.0, via Wikimedia Commons
Care level
Beginner
Adult size
9.5 cm in aquariums
Minimum tank
114 litres
Temperament
Aggressive
With corals
Reef safe
Captive-bred
Wild-caught (captive-bred rare)
IUCN status
Least Concern
Show volumes in

How do you care for the humbug damsel?

Aggressive as adults.

Feeding

Omnivore.

Takes anything.

Tank and special needs

Plan for at least 114 litres of water (the care sheet says 30 US gallons).

Never use fish to cycle a tank.

Corals and invertebrates

None to corals.

Which tankmates suit the humbug damsel?

Only with moderately aggressive fish; a reviewer reported it harassed a chromis to death (LiveAquaria review).

Suggested order in a mixed tank: add last, after the peaceful fish have settled.

More than one humbug damsel

Keep one humbug damsel: two of the same species usually fight.

Other fish

Checked against the other 59 fish in this guide, assuming a tank big enough for both. Individual fish differ, so treat this as a starting point.

Avoid together (7)

  • Neon gobyHumbug damsel is aggressive and may bully the neon goby, which is small enough to be driven into hiding or killed.
  • Yellow clown gobyHumbug damsel is aggressive and may bully the yellow clown goby, which is small enough to be driven into hiding or killed.
  • Hi-fin red banded gobyHumbug damsel is aggressive and may bully the hi-fin red banded goby, which is small enough to be driven into hiding or killed.
  • Green chromisHumbug damsel is aggressive and may bully the green chromis, especially if the bully is added first. Humbug damsels have been reported harassing chromis to death.
  • Yellowtail blue damselBoth are damsels of similar shape, which is a common trigger for fights.
  • Blue damselBoth are damsels of similar shape, which is a common trigger for fights.
  • Azure damselBoth are damsels of similar shape, which is a common trigger for fights.

Take care (23)

  • Ocellaris clownfishHumbug damsel is aggressive and may bully the ocellaris clownfish, especially if the bully is added first.
  • Yellow watchman gobyHumbug damsel is aggressive and may bully the yellow watchman goby, especially if the bully is added first.
  • Orange spotted gobyHumbug damsel is aggressive and may bully the orange spotted goby, especially if the bully is added first.
  • Gold head sleeper gobyHumbug damsel is aggressive and may bully the gold head sleeper goby, especially if the bully is added first.
  • Rainford's gobyHumbug damsel is aggressive and may bully the rainford's goby, especially if the bully is added first.
  • Tailspot blennyHumbug damsel is aggressive and may bully the tailspot blenny, especially if the bully is added first.
  • Pyjama cardinalfishHumbug damsel is aggressive and may bully the pyjama cardinalfish, especially if the bully is added first.
  • Yellow coris wrasseHumbug damsel is aggressive and may bully the yellow coris wrasse, especially if the bully is added first.
  • Red head solon fairy wrasseHumbug damsel is aggressive and may bully the red head solon fairy wrasse, especially if the bully is added first.
  • Carpenter's flasher wrasseHumbug damsel is aggressive and may bully the carpenter's flasher wrasse, especially if the bully is added first.
  • Melanurus wrasseHumbug damsel is aggressive and may bully the melanurus wrasse, especially if the bully is added first.
  • Leopard wrasseHumbug damsel is aggressive and may bully the leopard wrasse, especially if the bully is added first.
  • Bluestreak cleaner wrasseHumbug damsel is aggressive and may bully the bluestreak cleaner wrasse, especially if the bully is added first.
  • FirefishHumbug damsel is aggressive and may bully the firefish, especially if the bully is added first.
  • Purple firefishHumbug damsel is aggressive and may bully the purple firefish, especially if the bully is added first.
  • Scissortail dartfishHumbug damsel is aggressive and may bully the scissortail dartfish, especially if the bully is added first.
  • Royal grammaHumbug damsel is aggressive and may bully the royal gramma, especially if the bully is added first.
  • Yellowhead jawfishHumbug damsel is aggressive and may bully the yellowhead jawfish, especially if the bully is added first.
  • Mandarin dragonetHumbug damsel is aggressive and may bully the mandarin dragonet, especially if the bully is added first.
  • Spotted mandarinHumbug damsel is aggressive and may bully the spotted mandarin, especially if the bully is added first.
  • Moorish idolHumbug damsel is aggressive and may bully the moorish idol, especially if the bully is added first.
  • Harlequin filefishHumbug damsel is aggressive and may bully the harlequin filefish, especially if the bully is added first.
  • Copperband butterflyfishHumbug damsel is aggressive and may bully the copperband butterflyfish, especially if the bully is added first.
Usually fine together (29)

Invertebrates

Only the invertebrates with a known risk are listed.

Take care (2)

  • Tiger tail sea cucumberA stressed or dead tiger tail sea cucumber can release toxins that harm fish; cover pump intakes.
  • Sea appleA stressed or dead sea apple can release toxins that harm fish; cover pump intakes.

Corals and anemones

Only the corals and anemones with a known risk are listed.

Take care (1)

These checks follow the reasons fish and invertebrates clash: same species or genus, similar shape, mouth size, temperament, food, burrows, tank size and the order they are added. Individual animals differ; every source agrees on that.

Quarantine and health

Hardy.

New fish are the most common way disease gets into a reef tank. Quarantine every fish in a separate tank before it joins the display, and choose a method that suits its tolerance of copper.

Captive-bred or wild?

Mostly wild.

Sources

  1. LiveAquaria (US retailer) care sheetRead 21 October 2026, read in full. Used for: stats.
  2. FishBase species summaryRead 21 October 2026, read in full. Used for: max length, IUCN.

Last checked . How we check

Found a mistake? Tell us how to fix it.