Gobies are incredibly popular among aquarium hobbyists, with many species beloved for their ornate coloration and intriguing behavior. Though suitably sized for nano tank setups, gobies often exhibit territorial tendencies that can lead to stocking challenges. It’s crucial to keep this factor in mind when deciding whether to keep more than one goby in a tank and, if so, how many.
In this guide, we’ll dive into typical goby behavior to learn what you can expect from these fascinating fish in your home aquarium. We’ll explore their territorial tendencies and offer advice for setting up, stocking, and maintaining your tank. Let’s get started!
Understanding Goby Behavior
There are over 2,000 different known species of gobies spread throughout freshwater, saltwater, and brackish environments. Though each species is unique, gobies are generally bottom dwellers who claim their space by digging burrows into the substrate.
Though not all species of goby are territorial, some have a reputation for aggressively defending their favorite burrows. Examples include the knight goby (Stigmatogobius sadanundio), bumblebee goby (Brachygobius xanthomelas), and watchman goby (Cryptocentrus sp.). In many cases, it’s the males of the species that exhibit strong territorial tendencies while females may gather in loose groups or even intermingle with other goby species.
Many gobies are peaceful with other species, particularly similarly sized fish and other bottom-dwellers. The best tank mates for gobies are generally fish that come from similar natural habitats, such as fast-flowing streams or brackish environments.
How Many Gobies Can You Keep Per Tank?
When stocking gobies in your aquarium, how many you can keep depends on several factors. Guidelines like the “one inch of fish per gallon of tank volume” are a good place to start, but should be taken with a grain of salt. Some goby species need more space than others, especially those with territorial tendencies.
Here are some factors to consider when deciding how many gobies to keep in your tank:
● Tank size - The minimum recommended tank size for nano gobies is 10 gallons per fish, with larger or more territorial species needing upwards of 20 gallons each.
● Adult size - Popular goby species generally range from 1-4 inches in length. Factor in the mature size of each species, not the size they are when you buy them.
● Tank setup - Gobies are bottom-dwellers, so how many you can stock in a tank may depend on the amount of available caves and substrate appropriate for burrowing.
● Species compatibility - Peaceful species like blue neon gobies may be better suited to living in groups than more aggressive species (especially males).
If you’re stocking multiple gobies in your tank, it’s often wise to introduce them at the same time to prevent one fish from claiming the whole tank as its territory. That said, you want to avoid adding more fish than your tank can handle. For community tanks, slowly introduce peaceful species and add your gobies last once the tank has acclimated.
Tank Size & Layout Considerations
While tank size is a good metric to consider when determining how many gobies to stock in your tank, it’s not necessarily the most important. Because gobies are bottom-dwellers, you need to think about the amount of available floor space. The dimensions of your tank (specifically the length and width) matter more than the height or depth.
Even gobies that aren’t overly territorial like to have plenty of hiding places to choose from. Your tank setup should include a variety of caves and pieces of driftwood for gobies to hide under as well as substrate fine enough for burrowing (depending on species preference).
If you’re stocking highly territorial species in your goby tank, setup may be even more important than space. It’s crucial to provide enough caves or burrows for each fish to claim and to use decorations to break up sightlines between territories. Not only can this reduce territorial tendencies, but it helps minimize stress among your fish.
Best Practices for Goby Stocking
There’s no hard and fast rule for stocking an aquarium, especially if you’re mixing species. If you’re hoping to keep multiple gobies in your tank, however, there are a few things you can do to increase the chances of success.
Here are some tips for stocking gobies in your tank:
● Make sure your tank is fully cycled before adding any fish, and introduce them slowly to avoid overwhelming the biological filter.
● Stock your tank in order from most peaceful to the most territorial species, adding more aggressive species at the same time when possible.
● Monitor your tank inhabitants for signs of poor compatibility and have a backup plan in place in case you need to separate some fish.
● Perform regular water changes to keep the water quality in your tank high and the conditions stable in order to minimize triggers for stress.
● Stick to one species of goby in small tanks, aiming for a ratio of one male per several females rather than multiple males.
Always research the goby species you’re planning on stocking in your tank before you purchase them. This is the best way to double-check that your tank meets minimum size requirements and enables you to cater your tank setup to the specific fish you’re introducing.
Signs of Overcrowding
Even if you take care to set up your goby tank properly, it’s important to monitor for signs of overcrowding. Introducing fish too quickly or utilizing underpowered equipment could overwhelm your tank’s biological filter, leading to issues with water quality and ammonia buildup. Test your tank water weekly to check the chemistry and make adjustments as needed.
In addition to monitoring the water chemistry in your tank, keep an eye on your fish for signs of stress such as:
● Faded coloration
● Loss of appetite
● Fins clamped against the body
● Erratic behavior
● Gasping at the tank’s surface
If goby aggression is causing issues in your tank, you can always try rearranging it. In a sense, this can help reset the social dynamics in your tank by requiring the fish to establish new territory. Be mindful of providing multiple hiding places and break up sightlines between territories with strategic use of decorative items.
Final Thoughts
There’s a wide variety of goby species to choose from, making it easy to find the perfect fit for your aquarium. Whether you’re setting up a nano tank or a large community aquarium, you can find what you need at Shrimpy Business.
Learn more about freshwater goby care at Shrimpy Business or shop the full selection of nano fish to start stocking your tank!