Can You Put Fish In A Terrarium Terraria – ? The Expert Reality Check
No, you cannot put fish in a standard enclosed terrarium. Fish require a fully aquatic environment with filtration, oxygenation, and stable water parameters that a typical terrarium cannot provide.
If you have been browsing beautiful, mossy, glass-enclosed landscapes and wondering, “can you put fish in a terrarium terraria,” you are certainly not alone. The aesthetic appeal of a miniature forest inside a glass jar is undeniable. However, as someone who has spent over a decade maintaining both terrestrial setups and thriving freshwater aquariums, I must clarify the fundamental differences between these two worlds.
A terrarium is designed as a closed or semi-closed system for plants, mosses, and sometimes small invertebrates like isopods or springtails. These systems rely on humidity and moisture levels that would be fatal to most fish. Adding water-breathing animals to such a setup is a recipe for disaster.
Why a Terrarium is Not an Aquarium
The most critical factor to understand is the biological demand of your aquatic pets. Fish are not just living ornaments; they are complex organisms that produce waste and require specific oxygen levels.
In a traditional terrarium, the soil and air circulation are intended to support plant life. There is no biological filtration to process ammonia, which is the toxic byproduct of fish waste. Without a filter and proper water volume, ammonia spikes occur rapidly, leading to stress, illness, and death for any fish trapped in that environment.
The Problem with Oxygen Exchange
Fish need dissolved oxygen in the water column. In a stagnant, small-volume container like a terrarium, oxygen depletion happens within hours. While some plants produce oxygen, they cannot keep up with the metabolic rate of a fish in such a cramped space.
Common Mistake: Many beginners confuse a “bowl” with a “terrarium.” While some people keep fish in large, filtered bowls, a sealed terrarium lacks the gas exchange surface area needed to keep the water healthy. Never confuse the two.
Can You Put Fish in a Terrarium Terraria? Understanding Paludariums
If you are set on having both terrestrial plants and aquatic life, you are actually looking for a paludarium. A paludarium is a hybrid setup that combines both land and water. Unlike a standard terrarium, a paludarium is built with the intention of housing aquatic life in a specific section of the container.
To do this successfully, you must have a dedicated water section that is large enough to be filtered and heated. Even in a paludarium, you must ensure the terrestrial section does not leach soil or debris into the water. This contamination can quickly degrade water quality, making it impossible to maintain a healthy community fish tank environment.
Essential Requirements for Keeping Fish Safely
If you decide to pivot from a terrarium to an aquarium, you need to provide the right conditions. Fish keeping is all about stability. Whether you are keeping a few shrimp or a school of tetras, the basic hardware remains the same.
| Requirement | Why It Matters |
|---|---|
| Filtration | Removes ammonia and nitrites through biological cycling. |
| Water Volume | Dilutes waste; smaller volumes crash much faster. |
| Oxygenation | Ensures fish can breathe; surface agitation is key. |
| Heating | Maintains metabolic stability for tropical species. |
How to Properly Transition to an Aquarium
If you were hoping to put fish in a terrarium, I encourage you to channel that creative energy into an aquascape instead. You can still achieve that lush, green “jungle” look by using aquatic plants.
Start by selecting a tank size appropriate for the fish you want to keep. In my experience, a 10-gallon tank is the absolute minimum for a beginner. It provides enough water volume to prevent sudden chemical swings, which are the primary cause of beginner failure.
Creating a Lush Aquascape
Use driftwoods, rocks, and carpeting plants to create the visual depth of a terrarium. Many aquatic plants, like Anubias or Java Fern, thrive in low-tech setups and provide excellent hiding spots for your fish. This approach gives you the beauty of a garden with the safety of a proper aquarium.
Pro Tip: When setting up a new tank, always “cycle” the filter before adding fish. This allows beneficial bacteria to colonize the media, effectively turning your filter into a miniature waste-processing plant.
Frequently Asked Questions
Can I keep a Betta in a sealed terrarium?
Absolutely not. Bettas are tropical fish that require a heater, a filter, and at least 5 gallons of water to thrive. A sealed terrarium will quickly become a toxic, suffocating environment for them.
What about shrimp? Can they live in a terrarium?
While shrimp are hardier than most fish, they still require a clean, oxygenated water column. They are highly sensitive to fluctuating ammonia levels. They belong in a filtered, established aquarium, not a terrarium.
Is there any animal that lives in a terrarium?
Yes, certain land-based animals like isopods, snails, or dart frogs (in specialized enclosures) are perfect for terrariums. These species are adapted to high humidity and terrestrial living, unlike fish.
Why do some online photos show fish in jars?
Those photos are often staged for aesthetic purposes and do not represent long-term, ethical fish keeping. Keeping a fish in a small, unfiltered container is considered cruel and is not recommended by any reputable hobbyist.
Conclusion
When asking “can you put fish in a terrarium terraria,” the answer is a firm no for the sake of the animal’s welfare. Fish are aquatic creatures that depend on complex life-support systems to survive. By choosing to build a proper aquarium, you provide a safe, healthy, and beautiful home for your fish rather than a cramped, toxic trap.
If you are captivated by the look of terrariums, I highly recommend exploring the world of planted aquascapes. You can have your lush, green miniature world while ensuring your fish live a long and healthy life. Always prioritize the biological needs of your pets, and you will find the hobby of fish keeping to be an incredibly rewarding experience.