Forktail Blenny

Forktail Blenny

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The Forktail Blenny (Meiacanthus atrodorsalis) is a small, intriguing, and often overlooked saltwater fish that can be a unique and entertaining addition to a saltwater aquarium. These blennies are known for their interesting behaviors and striking appearance. Here's a care guide to help you maintain a Forktail Blenny in your saltwater aquarium.

Tank Size

A minimum tank size of 30 gallons (approximately 113 liters) is suitable for a single Forktail Blenny. Larger tanks offer more swimming space and are preferred.

Water Quality

Maintain stable water parameters with a temperature range of 72-78°F (22-26°C) and a specific gravity of around 1.025. Regularly test and adjust pH, ammonia, nitrites, and nitrates to ensure optimal water quality.


Employ a reliable filtration system, such as a protein skimmer or a canister filter, to remove waste and maintain water clarity. Live rock can help provide biological filtration and create hiding spots for your Blenny.


Forktail Blennies are omnivorous and primarily feed on tiny invertebrates and algae. Offer a balanced diet that includes high-quality frozen or live foods such as copepods, amphipods, brine shrimp, and mysis shrimp. You can also provide marine pellets and flakes designed for omnivorous fish.

Feeding Schedule

Feed your Forktail Blenny multiple times a day, as they have small stomachs and benefit from frequent feedings.


Forktail Blennies are generally peaceful and can coexist with a variety of other peaceful reef fish. Ensure that tankmates are compatible with Blennies and will not harass or outcompete them for food.

Hiding Spots

Provide hiding spots using live rock, caves, and crevices to make your Forktail Blenny feel secure. They often dart into hiding when they feel threatened or stressed.

Water Flow and Lighting

Moderate water flow is suitable for these blennies. Lighting requirements will depend on your overall aquarium setup, but they don't have specific lighting needs.


Quarantine new fish before introducing them to your main tank to prevent the spread of disease.


Regularly monitor your fish for any signs of stress, disease, or aggression, and take appropriate actions if any issues arise.

Forktail Blennies are known for their interesting behavior, including perching on rocks and poking out from crevices. They can be a fun and visually appealing addition to your saltwater aquarium. As with any marine species, maintaining proper water quality and providing a varied diet are key to keeping them healthy and happy.