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Can pothos be fully submerged in a fish tank? No, pothos cannot be fully submerged in a fish tank over the long term.
Many aquarium lovers ask if pothos can be fully submerged in a fish tank because they see other plants thriving underwater.
Pothos is not an aquatic plant and its leaves require air to survive and grow properly.
However, the roots of pothos can be fully submerged in a fish tank and actually thrive when placed that way.
So when you wonder can pothos be fully submerged in a fish tank the answer is a careful no for the leaves but a confident yes for the roots.
In this post we will explore why pothos cannot be fully submerged, how to safely place it in your aquarium, and the many benefits it brings.
Let’s get started.
Why Pothos Cannot Be Fully Submerged In A Fish Tank
The biggest reason pothos cannot be fully submerged in a fish tank comes down to its basic biology.
Pothos is classified as a terrestrial plant which means it evolved to live above water.
Fully submerging pothos in a fish tank cuts off its access to the air it needs.
Here is a closer look at why fully submerged pothos will struggle:
1. Leaves Need Air Exchange
Pothos leaves absorb carbon dioxide from the air and release oxygen during photosynthesis.
When pothos is fully submerged in a fish tank the leaves cannot get enough carbon dioxide.
They can absorb some dissolved gases from the water but not enough to stay healthy.
That is why fully submerging pothos in a fish tank leads to slow suffocation of the foliage.
The leaves will yellow, become limp, and eventually die.
2. Rotting Leaves Harm Water Quality
If you fully submerge pothos in a fish tank the leaves will begin to decompose.
Rotting plant matter releases ammonia into the water which is toxic to fish.
So fully submerging pothos in a fish tank does not only hurt the plant.
It also puts your fish at risk of poor water conditions.
This is a key reason experienced aquarists avoid fully submerging pothos leaves.
3. Stems Become Soft and Rot Quickly
Pothos stems are not built for constant submersion.
When pothos is fully submerged in a fish tank the stems soften and lose their structure.
This makes the plant prone to rotting from the inside out.
Even robust pothos plants will decline if their stems stay underwater.
So can pothos be fully submerged in a fish tank? Only briefly, and never as a permanent setup.
4. No Adaptation for Underwater Life
Unlike true aquatic plants, pothos has no specialized tissues for living fully underwater.
Aquatic plants have thin leaves that absorb nutrients and gases directly from water.
Pothos has thick waxy leaves designed to hold moisture in the air.
Fully submerging pothos in a fish tank reverses its natural design.
That is why pothos being fully submerged in a fish tank almost always ends badly.
How To Use Pothos In A Fish Tank Without Full Submersion
Since pothos cannot be fully submerged, the trick is to keep leaves dry and roots wet.
When set up correctly pothos becomes one of the best plants for aquarium filtration.
Here are the best ways to enjoy pothos in your fish tank:
1. Let Only the Roots Hang Into the Water
Place the pothos plant at the top of your tank so only the roots go underwater.
The roots absolutely love being fully submerged in a fish tank environment.
They grow long, thick, and fast when given constant access to aquarium water.
The leaves and stems stay above the water line where they can breathe.
This setup gives you all the benefits without pothos being fully submerged.
2. Secure With a Clip or Suction Cup
Use a plant clip or a suction cup to hold the pothos in place at the rim.
This keeps the plant from slipping fully into the water.
Many aquarists use simple clips from hardware stores or aquarium supply shops.
The roots dangle freely into the tank and absorb nutrients around the clock.
This method allows pothos to thrive without being fully submerged in a fish tank.
3. Place in a Hang-On Back Filter
A hang-on back filter is a perfect home for pothos.
You can place the plant in the filter compartment where the water flows through.
The roots grow directly into the filter water and absorb waste products.
The leaves stay completely dry and grow vigorously.
This is one of the most popular ways to use pothos without fully submerging it.
4. Grow Through a Lid Opening
If your tank has a lid, let the pothos vines grow out through a small gap.
The roots stay fully submerged inside the tank while the leaves grow outside.
This creates a beautiful natural look that many aquarists love.
It also solves the problem of pothos being fully submerged in a fish tank.
The plant gets the best of both worlds roots in water and leaves in air.
Benefits Of Using Pothos In Your Fish Tank
Pothos offers huge benefits even though it cannot be fully submerged.
The roots do all the work underwater and they do it exceptionally well.
Here is why you should add pothos to your aquarium:
1. Natural Nitrate and Phosphate Removal
Pothos roots are nutrient sponges that absorb nitrates and phosphates from the water.
These compounds build up from fish waste, leftover food, and plant decay.
High nitrate levels stress fish and fuel algae blooms.
Pothos roots lower these levels naturally without any extra equipment.
This benefit works perfectly even though pothos cannot be fully submerged in a fish tank.
2. Significant Algae Reduction
Because pothos roots consume nutrients so aggressively, algae get less food.
Many aquarists report a noticeable drop in algae after adding pothos.
The plant outcompetes algae for the same resources.
You get cleaner glass and less scrubbing over time.
All of this happens without pothos being fully submerged in the fish tank.
3. Better Oxygen Levels and Beneficial Bacteria
Pothos roots release oxygen into the water as they grow.
This extra oxygen benefits your fish and the helpful bacteria in your filter.
The roots also provide a large surface area for bacteria to colonize.
More bacteria means better biological filtration and cleaner water.
So pothos improves your entire aquarium ecosystem while only roots are submerged.
4. Low Maintenance and Fast Growth
Pothos is one of the easiest plants to care for in an aquarium setup.
It requires no special lighting, no fertilizer, and no CO2 injection.
The roots grow rapidly and start filtering the water within days.
You simply trim the vines when they get too long.
This makes pothos perfect for beginners who want natural filtration.
So, Can Pothos Be Fully Submerged In A Fish Tank?
Can pothos be fully submerged in a fish tank? No, pothos cannot be fully submerged in a fish tank long term without suffering serious damage.
The leaves and stems need access to air to survive and thrive.
However, pothos roots can be fully submerged and they grow beautifully in aquarium water.
When set up with roots in the water and leaves in the air, pothos becomes a powerhouse natural filter.
So while pothos cannot be fully submerged, it can still transform your fish tank for the better.
We hope this post has helped you understand why pothos cannot be fully submerged and how to use it safely in your aquarium.