Do zebra danios attack guppies?

When it comes to keeping fish as pets, it’s important to understand the different interactions that can occur between species within the same tank. One question that many fish keepers have is whether or not zebra danios are likely to attack guppies. In this article, we’ll explore the different factors that can influence the behavior of zebra danios and guppies, and whether or not attacks are likely to occur.

Zebra danios are active, schooling fish that are native to the fast-flowing streams of Southeast Asia. They are known for their distinctive stripes and energetic swimming style, and are a popular choice for home aquariums due to their ease of care and hardiness. Guppies, on the other hand, are native to South America and are also popular for their bright colors and hardiness. While both species are relatively peaceful and compatible with a wide range of other fish, there is some potential for conflict between zebra danios and guppies.

Tank Size and Population Density

One of the most important factors to consider when deciding whether or not zebra danios and guppies can coexist in the same tank is the size of the tank itself. If the tank is too small, the fish will be more likely to become stressed and aggressive, which can lead to attacks. A good rule of thumb is to provide at least 10 gallons of water per zebra danio, and 5 gallons per guppy. This will give the fish enough space to swim and establish their own territories, reducing the likelihood of conflict.

In addition to tank size, the population density of the fish is also important. If there are too many fish in the tank, the fish may become more territorial and aggressive, leading to attacks. It’s important to maintain a balanced population density, with enough room for each fish to have their own space.

The Nature of Zebra Danios and Guppies

Another factor that can influence the behavior of zebra danios and guppies is the nature of the species themselves. Zebra danios are naturally active and curious fish that are constantly swimming and exploring their environment. They are also social fish that prefer to school with others of their own species. Guppies, on the other hand, are less active and tend to spend more time resting and hiding. While both species are generally peaceful, there is a possibility that zebra danios may become aggressive towards guppies if they perceive them as a threat or competition.

Water Quality and Conditions

The water quality and conditions in the tank can also play a role in determining the behavior of zebra danios and guppies. If the water is not kept clean and well-maintained, the fish may become stressed and more likely to attack each other. It’s important to regularly perform water changes, maintain a stable pH and temperature, and avoid overfeeding to keep the water conditions in the tank healthy.


In conclusion, while zebra danios and guppies can generally coexist in the same tank, there are a number of factors that can influence their behavior and the likelihood of attacks. These include tank size and population density, the nature of the species, and water quality and conditions. By carefully monitoring these factors and making adjustments as needed, you can help ensure that your zebra danios and guppies live harmoniously and peacefully together.