Yellowtail Damselfish

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The Yellowtail Damselfish (Chrysiptera parasema) is a hardy and vibrant saltwater fish known for its electric blue body and bright yellow tail. It’s one of the best entry-level marine fish, offering strong color, durability, and active behavior while remaining more peaceful than most other damselfish species.

Quick Care Facts

• Care Level: Easy
• Temperament: Semi-aggressive
• Diet: Omnivore
• Reef Safe: Yes
• Minimum Tank Size: 30 gallons
• Max Size: ~2.5–3 inches
• Origin: Indo-Pacific
• Shipping Size: 1–2 inches

Behavior & Compatibility

The Yellowtail Damselfish is known for being one of the least aggressive damselfish, making it a solid option for community reef tanks. However, it can still show territorial behavior, especially in smaller tanks or when competing for space.

It does best with other semi-aggressive or peaceful fish that can hold their own without provoking conflict. Avoid housing with highly aggressive species or overcrowding the tank, as this can increase territorial behavior.

Diet & Feeding

Yellowtail Damselfish are omnivores and very easy to feed. They will readily accept:

• flakes and pellets
• frozen mysis shrimp
• brine shrimp
• general marine foods

Feed 1–2 times daily. They are not picky eaters and adapt quickly to most feeding routines.

Tank Setup

A minimum of 30 gallons is recommended, though larger tanks help reduce territorial behavior.

For best results, provide:

• Live rock for hiding and territory
• Open swimming space
• Stable water conditions
• Moderate water flow

They will establish a small territory within the tank, especially around rock structures.

Reef Safety

The Yellowtail Damselfish is reef safe and will not harm corals or invertebrates. It’s a great choice for reef aquariums due to its durability and minimal impact on the system.

Acclimation & First 48 Hours

This is a hardy species that adapts quickly:

• Acclimate slowly to match water parameters
• Introduce into a stable tank
• Provide structure for territory

They typically begin feeding quickly and settle in without issues.