© Diego Delso / CC BY-SA 4.0Neon damselfish
The Neon damselfish is a small damselfish with a vivid neon-blue body and yellow running from the belly to the tail fin. It is a familiar sight on rocky shores in southern Japan, and the extent and depth of the yellow vary from fish to fish. Growing to a maximum total length of 9 cm, it is rated as beginner-friendly, which makes it an approachable first saltwater fish. Like other damselfish, it can be territorial, so plan your tank size and tank mates carefully to enjoy its blue-and-yellow color.
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Apply as a breederNeon damselfish key facts
- Care level
- Beginner-friendly
- Lifespan
- Little data available
- Size
- Up to 9 cm TL (FishBase)
- Temperature
- 23〜28℃
- Diet
- Omnivore (zooplankton and algae)
- Water Temperature & Quality
- 23-28°C, specific gravity 1.020-1.026 (Saltcorner).
- Container & Tank
- About 110 L (30 gallons) or more; about 190 L (50 gallons) for a group reduces chasing. Provide rockwork for cover.
- Tank Mates & Compatibility
- In small numbers the dominant fish harasses the others, so keep five to seven or more, or just one. It may pester other damselfish.
- Reef Compatibility
- Leaves corals alone; reef-safe.
- Diet & Feeding
- Readily eats prepared foods, frozen brine shrimp and mysis, and spirulina-based foods, once or twice a day.
- Health & Cautions
- The trade name "neon damsel" often refers to a different species, Neoglyphidodon oxyodon. This species is identified by its blue body with yellow belly and tail.
About Neon damselfish
The Neon damselfish is a small, beginner-friendly damselfish with a neon-blue body and yellow toward the tail, up to 9 cm long. Key traits and pre-purchase tips.
7 things to know before welcoming a Neon damselfish
1Body and Color
The body is neon blue, with yellow from the belly to the tail fin. The extent and depth of the yellow differ between individuals, so check the photos on the listing page for a color pattern you like. The maximum total length is 9 cm.
2Beginner-Friendly
Its care difficulty is rated as beginner-friendly, so it is easy to consider as an entry-level saltwater fish. Still, as a marine fish it needs steady management of water quality and salinity. Set up the tank in advance and bring the fish home only after the water has stabilized.
3Watch for Territoriality
Damselfish can be territorial and may chase members of their own species or fish with a similar body shape. If you keep several together or with gentle tank mates, provide hiding places and watch how they behave as you go.
4Tank and Layout
Although it only reaches 9 cm, plan on a tank of about 110 L or more, or about 190 L or more if you keep a group. Building hiding spots with live rock or similar decor helps the fish settle in. Keep the tank covered to prevent accidental jumping.
5Feeding
It tends to be omnivorous, feeding on algae and zooplankton, and generally takes commercial marine fish foods and frozen foods. Start with small portions and avoid letting uneaten food build up in the tank.
6Acclimation
Float the bag in the tank to even out the temperature, then add tank water little by little to acclimate the new fish slowly. Feed lightly right after arrival, and keep lighting changes and foot traffic to a minimum until the fish settles.
7Daily Health Checks
Watch the fish's body color, breathing, and response to food every day so you notice any change from normal early. If you see white spots or a drop in appetite, consult the breeder you bought from or a saltwater fish specialist before trying strong medications on your own.
Frequently asked questions about Neon damselfish
- Q.Can a beginner keep this fish?
- A.Its care difficulty is listed as beginner-friendly. It is still a saltwater fish, so you will need to set up the tank properly and manage water quality and salinity.
- Q.How large does it grow?
- A.The maximum total length is 9 cm (FishBase). Sizes vary between individuals, so also check the size stated on the listing page.
- Q.Can I keep several together?
- A.Damselfish can chase one another out of territorial behavior. If you add several, provide plenty of hiding places and watch how they get along. Starting with a single fish is the safer choice if you are unsure.
- Q.How long does it live?
- A.Little reliable information is available on its lifespan, so a specific number of years cannot be given. Keep up with regular water care and daily observation, and respond to how your individual fish is doing.
- Q.Is the yellow the same on every fish?
- A.No, the extent and depth of the yellow vary from fish to fish. If you have a preferred look, check the photos and description on the listing page and feel free to ask the breeder.
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