Yellow Tail Blue Chromis Chrysiptera Parasema

The Yellowtail Blue Chromis, sometimes called the Yellowtail Damselfish, is a small but brilliantly coloured marine fish. Its body is an intense electric blue, contrasted by a bright yellow tail fin. Reaching only 6–7 cm (2.5–3 inches), this hardy and vibrant fish is a long-standing favourite in the aquarium hobby. Despite being one of the more peaceful damselfish, they can still show territorial behaviour, especially in confined spaces.

Native to the Western Pacific, especially around the Philippines, Indonesia, and the Solomon Islands. Found in lagoons, sheltered reefs, and coral rubble zones, often close to protective crevices.

An omnivore with a big appetite. In aquariums they adapt readily to most foods:

• High-quality marine flakes and pellets (staple diet)
• Frozen mysis shrimp, brine shrimp, and cyclops
• Finely chopped seafood (shrimp, clam, squid)
• Spirulina and algae-based foods

Feed 2–3 small meals per day for best colour and health.

The Yellowtail Blue Chromis is one of the milder damselfish, but still semi-territorial. Good tank mates include:

• Clownfish
• Gobies and blennies
• Wrasses (reef-safe species)
• Cardinalfish
• Dwarf angelfish

Avoid housing with very shy fish that may be stressed by their activity, or with very aggressive species that could bully them.

Semi-aggressive. While considered peaceful by damselfish standards, they will defend a small territory, particularly in smaller aquariums. Best kept singly, in a bonded pair, or in larger groups (6+ in a spacious tank) to disperse aggression.

Beginner-friendly. Very hardy, colourful, and easy to feed, making them an excellent choice for new marine keepers and reef aquariums.

• Temperature: 24–28°C (75–82°F)
• pH: 8.1–8.4
• Salinity: 1.020–1.025 SG
• Hardness (dKH): 8–12
• Tank Size: Minimum 30 gallons (115L) for a single or pair; larger if keeping a group

Provide rockwork with caves and crevices so they can establish territories.

Reef safe. They do not harm corals or invertebrates, and their bright colour contrasts beautifully in reef setups.