What Fish Can Go With Blennies?

What Fish Can Go With Blennies?

Blennies are small, colorful fish that make a great addition to any saltwater aquarium. They are known for their unique behaviors and charming personalities. If you have a blenny in your tank and are considering adding other fish, it’s important to choose compatible tankmates that will coexist peacefully. In this article, we will explore some of the best fish companions for blennies, taking into consideration their temperament, size, and habitat preferences.

Choosing Compatible Tankmates

When selecting fish to keep with your blennies, it’s essential to consider their temperament, size, and habitat requirements. Blennies are generally peaceful and non-aggressive, but they can become territorial or aggressive towards similar-looking fish or those that encroach on their chosen sites. Therefore, it’s important to choose fish that have a peaceful nature and won’t pose a threat to your blennies.

Another factor to consider is the size difference between the blennies and potential tankmates. Blennies are relatively small fish, so it’s important to avoid keeping them with fish that are significantly larger and might view them as prey. It’s also important to consider the tank’s size and ensure that there is enough space for all the fish to swim freely and establish their territories.

Lastly, compatibility in terms of habitat preferences is crucial. Blennies are bottom-dwelling fish that like to explore rock structures and hide in crevices. Therefore, it’s important to choose fish that occupy different areas of the tank, such as mid to upper water column dwellers, to give each species their own space.

Compatible Fish for Blennies

Now that you understand the key factors to consider, let’s explore some of the best fish companions for blennies:

1. Gobies

Gobies are small and peaceful fish that make excellent tankmates for blennies. They share the same habitat preferences, with both species enjoying rock structures and hiding in crevices. Gobies come in a variety of colors and patterns, adding visual interest to your tank. Some popular gobies for tankmates include the Diamond Watchman Goby, Yellow Clown Goby, and Yasha Haze Goby.

2. Clownfish

Clownfish are another great companion for blennies. They are peaceful and come in a range of vibrant colors. While they primarily occupy the middle to upper portions of the water column, they won’t pose a threat to blennies in their preferred bottom-dwelling areas. Additionally, blennies and clownfish have different body shapes and colorations, reducing the likelihood of aggression between them.

3. Cardinalfish

Cardinalfish are calm and non-aggressive, making them ideal tankmates for blennies. They tend to occupy the mid to upper levels of the water column, allowing blennies to have their own space at the bottom. Cardinalfish are known for their unique behaviors, such as schooling and spawning rituals, which can add an interesting dynamic to your aquarium. Some popular choices include the Banggai Cardinalfish and Pajama Cardinalfish.

4. Royal Gramma Basslet

The Royal Gramma Basslet is a stunning and peaceful fish that can coexist harmoniously with blennies. They have a vibrant purple and yellow coloration that adds a pop of color to your tank. Royal Grammas tend to occupy the middle portion of the water column, while blennies explore the bottom. This separation of territories helps prevent conflicts and promotes peaceful coexistence.


When selecting tankmates for your blennies, it’s important to choose peaceful fish that have a compatible temperament, size, and habitat preferences. Gobies, clownfish, cardinalfish, and Royal Gramma Basslets are excellent choices that can create a harmonious and visually appealing aquarium. Remember to provide ample hiding spaces and ensure that each fish has enough space to establish its territory. By carefully considering these factors, you can create a thriving and balanced marine community in your tank. So go ahead, and add some companions to your blennies’ underwater world!