A juvenile is a velvet-black coin marked with three white dots, one per flank and one on the forehead. Charming at 2 cm and a genuine tyrant at 12, so read the second half of the label before buying.
Temperament
Common health issues
- Ich (white spot)
- Fin rot
- Parasites
Care at a glance
- ExerciseHigh
A busy, energetic swimmer โ keep plenty of open swimming room.
- GroomingRoutine tank care
Weekly partial water changes keep them in top shape.
- Living spaceNano-tank friendly
Happy in a small, stable, well-filtered tank.
- Owner experienceSome experience helps
A little know-how makes life smoother.
- Commitment8โ15 years
Plan for a long, loving relationship.
Health to watch: Ich (white spot) ยท Fin rot ยท Parasites
๐ Care guide
The Domino Damselfish, or three-spot dascyllus (Dascyllus trimaculatus), is an Indo-Pacific species including the Red Sea, reaching about 12 to 14 cm. Juveniles are jet black with three brilliant white spots, and shelter among anemones and urchins. The spots fade with maturity and adults turn a plain sooty grey-black, which surprises many owners who bought the juvenile for its markings. It is exceptionally hardy, tolerates 24-27C, salinity 1.023-1.026 and pH 8.1-8.4, and eats anything offered. That toughness is exactly why it was once sold as a tank-cycling fish, a practice to avoid. The real issue is temperament: adults are among the most aggressive fish commonly sold for reef tanks and will claim a large territory, harass tankmates and become nearly impossible to catch out of established rockwork. Keep it only in a 200 litre or larger tank with robust companions such as tangs or larger wrasses, and decide on it as a permanent choice rather than a starter fish.
Frequently asked questions
How active is a Domino Damselfish?
High. A busy, energetic swimmer โ keep plenty of open swimming room.
How much maintenance does a Domino Damselfish need?
Routine tank care. Weekly partial water changes keep them in top shape.
What tank size does a Domino Damselfish need?
Nano-tank friendly. Happy in a small, stable, well-filtered tank.
Is a Domino Damselfish a good fit for first-time owners?
Some experience helps. A little know-how makes life smoother.
How long do Domino Damselfish live?
8โ15 years. Plan for a long, loving relationship.
What health issues affect the Domino Damselfish?
Keep an eye out for Ich (white spot), Fin rot, Parasites. These are worth raising with your vet, along with any screening they recommend.
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