Goldtail Demoiselle (Chrysiptera parasema) M 6cm

Overview

The Goldtail demoiselle (Chrysiptera parasema) is one of the most popular marine damselfish for reef aquariums, prized for its intense blue body, vivid yellow tail and compact size. This medium-sized specimen is ideal for aquarists looking for a hardy, eye-catching saltwater fish that adapts well to stable marine conditions. Native to the Indo-Pacific, this species is active, alert and full of character, bringing constant movement and colour to the aquarium.

Although generally considered one of the more manageable damselfish, the Goldtail demoiselle can become territorial as it matures, especially in smaller tanks or when housed with timid tank mates. For best results, provide plenty of rockwork, caves and swimming space, and introduce it to the aquarium with a sensible stocking plan. In the right setup, this species can be a long-lived and rewarding addition to a marine community.

At Tropical Fish Co, we select healthy marine livestock and pack with care to help ensure a smooth transition into your aquarium. This fish is covered by our live arrival guarantee and we offer fast UK delivery for your convenience.

Care at a Glance

Origin & Natural Habitat

Chrysiptera parasema is found throughout the tropical Indo-Pacific, including reef systems around Indonesia, Papua New Guinea and nearby island groups. In the wild, Goldtail demoiselles inhabit shallow coral reefs, lagoons and reef slopes where there is ample live rock, broken coral structure and plenty of hiding places. They are commonly seen darting in and out of crevices, defending small territories and feeding on tiny drifting foods in the water column.

This natural environment explains much of their behaviour in captivity. They are hardy, adaptable and comfortable in reef-style aquariums with strong biological filtration, stable salinity and plenty of aquascaping. Their territorial instincts are also a natural part of their biology, so thoughtful tank planning is important for long-term success.

Tank Setup & Water Parameters

A mature marine aquarium with stable water chemistry is the key to keeping Goldtail demoiselles thriving. While they are resilient compared with many reef fish, they still require excellent saltwater husbandry. A minimum aquarium of 100 litres is suitable for a single specimen, though larger tanks are strongly recommended if keeping more than one damselfish or mixing with other semi-territorial species.

Use live rock or high-quality reef rock to create multiple caves, overhangs and line-of-sight breaks. This helps reduce aggression and gives the fish safe retreat areas. Good flow and efficient filtration are beneficial, as this species is active and produces waste like most marine fish. A securely covered tank is also wise, as damselfish can jump when startled.

Keep salinity stable at typical reef levels, and avoid rapid changes in temperature or water chemistry. Regular water changes, careful feeding and consistent maintenance will help maintain the vibrant colour and healthy behaviour this fish is known for.

Feeding Guide

Goldtail demoiselles are omnivores with a strong appetite. In the aquarium they readily accept a wide range of prepared marine foods, including quality pellets, flakes, frozen mysis, enriched brine shrimp, chopped seafood and algae-based foods. A varied diet supports colour, immune function and overall vitality.

Feed small portions once or twice daily, offering only what the fish can consume in a couple of minutes. Because damselfish can be bold feeders, ensure more timid tank mates are also getting their share. Including some plant matter or algae-rich foods in the diet helps mimic their natural feeding habits and supports balanced nutrition.

Tank Mates / Compatibility

Goldtail demoiselles can be kept with a range of robust marine species, especially in larger aquariums where territories can be established. They are generally best suited to confident tank mates that will not be bullied by their assertive nature. Suitable companions may include clownfish, larger gobies, blennies, wrasses, chromis and many peaceful reef-safe fish that are not overly delicate or slow-moving.

Avoid housing them with very timid species, tiny ornamental shrimp in some cases, or other highly territorial damselfish in smaller systems. In compact aquariums, aggression can become more pronounced, particularly towards similar-shaped or similarly coloured fish. Introducing the Goldtail demoiselle last can sometimes reduce territorial disputes, but tank size and aquascape remain the most important factors.

With the right setup, this species can be an excellent reef fish that adds both colour and personality without demanding specialist care. It is a strong choice for aquarists who want a hardy marine fish with plenty of visual impact.

Why Buy from Tropical Fish Co

At Tropical Fish Co, we understand that buying live marine fish online requires confidence, care and reliable service. That is why we focus on healthy livestock, careful packing and prompt dispatch. Your Goldtail demoiselle is backed by our live arrival guarantee, and we offer fast UK delivery to help your fish reach you in the best possible condition.

We aim to make marine fishkeeping more accessible by providing accurate species information and practical care advice, so you can set up your aquarium with confidence. Whether you are adding a single standout fish or building a reef community, the Goldtail demoiselle is a superb choice for colour, activity and resilience. Shop with Tropical Fish Co for quality marine livestock and dependable UK service.