You've probably seen those gorgeous aquarium setups on Instagram or Pinterest where a trailing green vine hangs over the tank, roots dipping into the water, fish swimming below. It looks effortlessly beautiful. And if you own a pothos plant already, you might be wondering whether you can just dunk those roots in and call it a day.
The short answer? Yes, it works. But there are some important details you need to get right first.
Whether you're a beginner fishkeeper who stumbled onto this idea by accident or a plant parent curious about trying something new, this guide will give you everything you need to know about growing pothos in an aquarium: why it works, how to set it up properly, what benefits it brings, and what mistakes to avoid.
Quick Answer: Can You Put Pothos in an Aquarium?
Yes, you can grow pothos in an aquarium. The plant thrives with its roots submerged in water while the leaves and stems remain above the waterline. Pothos absorbs nitrates, ammonia, and other dissolved nutrients directly through its roots, which helps improve water quality for fish. It is one of the easiest and most rewarding ways to add a natural filtration boost to any freshwater tank.
What Is Pothos and Why Does It Work So Well in Water?
Pothos (Epipremnum aureum) is a tropical vine native to the Solomon Islands. It is one of the most popular houseplants in the world because it tolerates low light, irregular watering, and general neglect better than almost any other species.
What makes pothos particularly useful in aquariums is its ability to grow in water with no soil at all. Most gardeners have propagated pothos by placing cuttings in a glass of water on a windowsill. The plant adapts quickly, growing long white roots that absorb nutrients directly from the liquid around them.
Inside an aquarium, those same roots do something remarkable. They actively pull nitrogen compounds from the water. Fish waste breaks down into ammonia, which converts to nitrite, then to nitrate. High nitrate levels stress fish and degrade water quality over time. Pothos roots absorb nitrate as a fertilizer, essentially feeding on the very compounds that harm your fish.
This is not just a pretty trick. It is a genuine natural filtration process.
Also read:
Pothos Plant Meaning: Symbolism & What It Represents
The Real Benefits of Adding Pothos to Your Fish Tank
Before you set anything up, it helps to understand what you are actually getting out of this arrangement. The benefits go well beyond decoration.
Natural Nitrate Removal
This is the biggest one. Nitrate buildup is one of the most common causes of algae growth and fish stress in home aquariums. Most filtration systems remove ammonia and nitrite efficiently but leave nitrate to accumulate until your next water change.
Pothos roots absorb nitrate continuously. Regular growers have reported measurable drops in nitrate levels within weeks of adding pothos to their tanks. How much it removes depends on the size of the root system, the tank volume, and how heavily stocked your tank is. But even modest results add up meaningfully over time.
Algae Reduction
Algae and pothos compete for the same nutrients. When pothos is actively growing and absorbing phosphates and nitrates, it starves out the algae. Many aquarium hobbyists notice a visible reduction in green algae on the glass and substrate after adding pothos to their setups.
This does not replace good tank husbandry, but it gives you a powerful natural ally.
Low Maintenance
Pothos requires very little attention once established. You are not dosing fertilizers, pruning underwater plants weekly, or managing CO2 injection. The pothos just grows. You trim it occasionally when it gets too long, and you are done.
For beginners especially, this makes it one of the most forgiving aquatic plant choices available.
Improved Oxygenation and Water Movement
As pothos roots spread through the water, they create gentle surface disturbance and add organic oxygen exchange at the waterline. The effect is modest but real.
Aesthetics and Natural Ambiance
Honestly, a healthy pothos trailing over a tank looks stunning. The bright green or variegated leaves contrast beautifully against aquarium glass and lighting. It transforms a basic fish tank into something that looks intentionally designed.
How to Set Up Pothos in Your Aquarium (Step by Step)
Getting this right the first time saves a lot of frustration. Follow these steps and your pothos will be thriving within a few weeks.
Step 1: Choose the Right Cutting or Plant
You can use a pothos cutting or an established plant. If you are starting from a cutting, choose a healthy stem with at least two or three nodes (the bumpy joints where leaves attach). Remove any leaves that would sit below the waterline to prevent rot.
If you already have a potted pothos, you can transition it by gradually washing away the soil and allowing it to adapt to water-only conditions. Do this slowly over one to two weeks to reduce transplant stress.
Step 2: Pick Your Method of Placement
There are three popular approaches:
The Hang-Over Method: Rest the pothos stems over the rim of the tank so the roots dangle inside the water. This works well for smaller tanks and requires no special equipment.
The Lid Cutout Method: If your tank has a plastic lid, cut a small opening and thread the stems through. The roots hang freely in the water while the plant sits on top of the lid.
The Overflow or Sump Method: For larger setups or sumps, pothos can be placed in the overflow chamber or sump compartment where water flows naturally. The roots get constant water exposure with excellent aeration.
Choose whichever suits your tank design best.
Step 3: Allow the Roots to Establish
New roots take time to develop. In the first two to four weeks, you will not see dramatic growth. The plant is adjusting to its environment. Keep the leaves out of the water entirely during this period and ensure the existing roots have access to light from a nearby window or aquarium light.
Patience here is essential. Do not uproot or move the plant repeatedly during establishment.
Step 4: Monitor Water Parameters
Once your pothos is in, test your water every one to two weeks. You should see nitrate levels gradually trending downward as the root system expands. If nitrate levels are still high after a month, consider whether your tank is overstocked or whether the pothos root system has not grown large enough yet.
A standard liquid test kit will give you accurate readings for ammonia, nitrite, and nitrate.
Step 5: Trim and Maintain
Pothos grows quickly once settled. Trim back the vines when they get long, both to keep things tidy and to encourage bushier, more vigorous root growth. Trim just above a node using clean scissors. You can propagate the cuttings in another container, gift them, or compost them.
Which Pothos Varieties Work Best in Aquariums?
Most pothos varieties adapt well to aquarium conditions, but some perform slightly better than others.
Golden Pothos is the most widely available and one of the most vigorous growers. It adapts to low light easily and produces dense root systems quickly. This is the best choice for beginners.
Marble Queen Pothos grows a little slower but is still effective. The white and green variegation looks beautiful against a fish tank background.
Neon Pothos produces bright chartreuse leaves that look vivid under aquarium lighting. It grows enthusiastically in water and is a visually striking option.
The Jade Pothos is a solid dark green variety with robust growth habits. It tends to produce very strong roots and tolerates a wide range of water temperatures.
The silver/satin pothos is technically a different genus (Scindapsus), but it behaves similarly and adapts to water root growth reasonably well.
For maximum nitrate removal, choose the most vigorous grower you can find, which is almost always Golden Pot
Related post:
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Pothos and Fish: What You Need to Know About Compatibility
The most common concern new hobbyists have is whether pothos is safe for fish. This is a fair question.
Is Pothos Toxic to Fish?
Pothos contains calcium oxalate crystals, which make it toxic to cats, dogs, and humans if ingested. However, fish do not eat pothos roots. The toxicity concern for fish is minimal under normal conditions.
The roots do not leach significant amounts of calcium oxalate into the water in concentrations that harm fish. Countless aquarium hobbyists keep pothos with goldfish, bettas, cichlids, tetras, and many other species without any observed harm.
That said, if you have large herbivorous fish like goldfish or plecos that aggressively nibble at plant roots, monitor the situation. These fish are unlikely to cause harm to themselves, but they may destroy your root system before it gets established.
Is Pothos Safe for Shrimp?
Yes. Shrimp keepers widely use pothos in shrimp tanks. The roots provide foraging surfaces where biofilm accumulates, which shrimp actively graze on. In fact, many shrimp breeders consider pothos one of the best plants to include in a shrimp tank precisely because it improves water quality while giving shrimp something to explore.
What Fish Tanks Work Best?
Pothos works in virtually any freshwater aquarium. It performs particularly well in:
- Betta tanks (the low-flow, warm conditions suit pothos perfectly)
- Community tanks with moderate fish loads
- Shrimp tanks
- Goldfish tanks (pothos can handle the high nitrate output goldfish produce)
- Turtle tanks (pothos can absorb the heavy waste load turtles generate)
Pothos is not suitable for saltwater or marine aquariums. The salt content in marine tanks is harmful to the plant.
Lighting Requirements for Aquarium Pothos
One of the most common questions is how much light Pothos needs when growing in an aquarium setup.
The good news is that pothos is one of the most light-tolerant plants you will encounter. It grows in low light, medium light, and bright indirect light with equal willingness.
For aquarium setups specifically:
If the pothos leaves sit above the tank and have access to a nearby window, ambient room light is usually enough to keep it growing steadily. It does not need direct sunlight.
If you have an aquarium light that provides some illumination to the water surface, the pothos will benefit from that too. However, the roots themselves grow in the dark water just fine. It is the leaves that drive photosynthesis and therefore drive nutrient uptake from the roots.
Avoid placing your tank setup in a completely dark room with no natural or artificial light reaching the leaves. Growth will slow significantly, and the plant may struggle to uptake nutrients efficiently.
Water Temperature and pH Considerations
Pothos is a tropical plant. It prefers water temperatures between 65°F and 85°F (18°C to 29°C), which overlaps comfortably with most tropical freshwater fish requirements.
Most tropical community fish tanks are kept between 72°F and 80°F. This is the sweet spot for pothos as well.
Pothos adapts to a wide range of pH levels. It does well in water ranging from pH 6.0 to pH 8.0. Unless you keep species that require very specific pH parameters, you will not need to make any adjustments.
Cold water tanks kept below 65°F may slow pothos growth considerably. In goldfish setups at room temperature (around 65°F to 72°F), pothos will still grow but somewhat more slowly than in warm tropical tanks.
Common Mistakes to Avoid
Even with a low-maintenance setup like this, there are a few pitfalls that trip people up regularly.
Submerging the Leaves
Pothos is not a true aquatic plant. If you submerge the leaves and stem completely, the plant will rot and die. Only the roots should ever be underwater. The stems and leaves must remain above the waterline at all times.
Using Pothos in Saltwater Tanks
Saltwater will kill pothos roots. This setup is freshwater only.
Expecting Immediate Results
New cuttings take time to grow roots substantial enough to make a noticeable difference to water chemistry. Give it four to eight weeks before evaluating results. If you are using an already rooted plant with a developed root system, results will come faster.
Neglecting Regular Trimming
If pothos is left untrimmed, it will eventually dominate the area around your tank and potentially interfere with your aquarium lid, equipment, or lighting. Regular trimming every few weeks keeps things manageable and actually encourages denser root growth below the waterline.
Forgetting to Remove Dead Leaves
Any leaf that dies and falls into the tank will decompose and spike ammonia levels. Check weekly and remove any yellowing or dead leaves before they drop into the water.
Practical Tips for Getting the Best Results
Here are some tried-and-tested tips that make a real difference.
Start with a rooted cutting rather than a bare stem if you can. A cutting with one to two inches of existing root will establish much faster than one that has to grow roots from scratch.
Place the tank near a bright window if possible. More light to the leaves means faster photosynthesis, which drives faster nutrient uptake from the water.
Use a hang-on-back filter alongside your pothos. The filter handles ammonia and nitrite conversion, while the pothos handles the resulting nitrate. They complement each other perfectly.
If you notice the root tips turning brown, it usually means too little light is reaching the leaves, or the roots are in very stagnant water with poor oxygenation. Try improving flow around the root zone.
Consider combining pothos with fast-growing stem plants inside the tank for even greater nutrient export. Plants like hornwort, water wisteria, or java moss work synergistically with pothos to keep water quality consistently excellent.
Expert Insights: What Experienced Aquarists Know About Pothos
Hobbyists who have kept aquariums for years have accumulated some nuanced knowledge about pothos that does not usually appear in beginner guides.
Root Zone Aeration Matters
The most effective pothos setups are those where the roots hang in areas with gentle water movement. A return flow from a filter, a small powerhead nearby, or placement near surface agitation all improve oxygen levels around the roots. This accelerates growth and nutrient uptake significantly.
In completely stagnant water, pothos roots can develop anaerobic conditions around their tips, which slows growth and occasionally causes rot at the root ends.
Bigger Root Systems Equal Better Filtration
A small cutting with a few thin roots provides minimal filtration benefit. The real nitrate-reduction power of pothos comes from an extensive, well-developed root system. Over time, a mature pothos plant in an aquarium can develop root masses that are genuinely impressive in size and that provide measurable, consistent water quality improvement.
Do not judge the effectiveness of pothos too early in the process. A system that has been running for six months will outperform a newly added cut dramatically.
Pothos Works Particularly Well in Heavily Stocked Tanks
Tanks that are moderately to heavily stocked produce more waste and therefore more nitrate. Pothos in these situations has more to eat and tends to grow faster. Conversely, in a lightly stocked, pristine tank, pothos growth may be slower because there is less nutrient load driving root development.
You Can Combine Multiple Plants
Running two or three pothos stems in different locations around the tank perimeter multiplies your nitrate removal capacity proportionally. There is no rule that says you can only use one plant per tank.
FAQ: Pothos Plant in Aquarium
Can pothos grow fully submerged in an aquarium?
No. Pothos is not a true aquatic plant and cannot survive if its leaves and stems are fully submerged. It will rot and die within days if kept entirely underwater. Only the roots should be in the water. The stems and leaves must remain above the waterline at all times.
How long does it take for pothos to lower nitrates in a fish tank?
You may start seeing measurable nitrate reduction within three to six weeks if using a cutting with some established roots. A bare cutting needs four to eight weeks just to develop roots and then another few weeks to begin making a noticeable difference. Results depend on root system size, tank volume, and stocking levels.
Does pothos need fertilizer when growing in an aquarium?
No. The fish waste in your aquarium provides all the nutrients the pothos needs. In fact, this is the whole point of the arrangement. The plant feeds on the waste compounds that would otherwise accumulate to harmful levels.
Can I use pothos in a betta fish tank?
Yes, betta tanks are one of the best environments for pothos. Bettas are typically kept in warm, low-flow setups that suit pothos perfectly. The plant also provides surface cover that bettas naturally enjoy resting under. It is one of the most recommended plant additions for betta tanks.
Will pothos roots harm my fish?
No. Fish generally ignore pothos roots. The roots are not toxic to fish in water, and most fish species show no interest in eating them. The calcium oxalate crystals that make pothos toxic to mammals are not released into the water in harmful concentrations. Countless aquarium keepers maintain fish of all species alongside pothos without incident.
How often should I trim pothos growing in my aquarium?
Trim as needed, typically every two to four weeks depending on how vigorously your plant is growing. Regular trimming encourages denser growth and more vigorous root production. Always use clean scissors and remove trimmed portions before they can fall into the tank.
Can I use pothos in a turtle tank?
Yes, and it is actually highly recommended. Turtles produce an enormous amount of waste, creating high nitrate loads that are difficult to manage. Pothos handles heavy nitrate loads very well. Just be aware that some turtles will eat or damage the roots and leaves if they can reach them. Placing the pothos so the leaves are out of the turtle's reach will protect the plant.
Does pothos grow faster in an aquarium than in soil?
It depends. Pothos in a heavily stocked aquarium with abundant nutrients in the water can grow quite vigorously. In a lightly stocked tank, it may grow more slowly than it would in good quality potting mix. Generally, aquarium pothos grows at a moderate pace comparable to a well-watered but not heavily fertilized potted plant.
Conclusion
The pothos plant in an aquarium is one of those ideas that sounds too good to be true until you actually try it. A beautiful trailing vine, cleaner water, less algae, and almost no extra work. It genuinely delivers on all of those promises when set up correctly.
The key things to remember are simple: keep the leaves above water, choose a healthy cutting to start, give it time to establish, and make sure the leaves get enough light to drive root activity. Everything else takes care of itself.
Whether you are managing a simple betta tank on your desk or a 55-gallon community setup in your living room, adding a pothos plant is one of the lowest-effort improvements you can make. Fish keepers who try it almost universally wonder why they waited so long.
If you have been curious about this approach, there really is no reason not to give it a go. Grab a healthy cutting from a friend, a garden center, or your own existing plant, trim the lower leaves, drop the roots over the edge of your tank, and watch what happens over the next few weeks.
Your fish will thank you for it.