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Yes, you can submerge pothos in a fish tank.
Many aquarium enthusiasts recommend submerging pothos in a fish tank because the plant helps keep water clean.
If you’re wondering can you submerge pothos in a fish tank, the short answer is yes but with a few important rules.
Only the roots and lower stems should go underwater while the leaves stay above the surface.
When you submerge pothos in a fish tank properly, the plant acts as a natural filter and absorbs nitrates.
This makes your aquarium healthier for fish and reduces how often you need water changes.
In this post, we’ll explore exactly can you submerge pothos in a fish tank, how to do it safely, and what to watch out for.
Let’s dive in.
Why You Can Submerge Pothos in a Fish Tank
Pothos is a versatile plant that adapts to both soil and water environments.
When you submerge pothos in a fish tank, the roots thrive underwater and pull out excess nutrients.
Here are the main reasons people choose to submerge pothos in a fish tank:
1. Natural Nitrate Absorption
Fish waste and leftover food produce ammonia that turns into nitrates.
Submerging pothos in a fish tank gives the plant access to those nitrates, which it uses as fertilizer.
The roots act like a sponge, reducing nitrate levels so your fish stay healthier.
Many aquarists report lower nitrate readings after adding pothos to their tank.
2. Oxygenation and Shade
The leaves above water release oxygen into the air, and the roots release some oxygen into the water.
When you submerge pothos in a fish tank, the plant also provides shade for fish that prefer dimmer light.
Betta fish, for example, love resting under the wide leaves of pothos.
3. Low Maintenance Alternative to True Aquatic Plants
True aquatic plants need special lighting, CO2, and fertilizers.
Submerging pothos in a fish tank is much easier because it grows fast and doesn’t need soil.
You simply let the roots dangle in the water while the stems and leaves stay dry.
It’s a popular choice for beginners who want to improve water quality without extra equipment.
How to Submerge Pothos in a Fish Tank Safely
If you decide to submerge pothos in a fish tank, follow these steps to avoid harming your fish or the plant.
Step 1: Choose a Healthy Pothos Cutting
Start with a fresh cutting that has several leaves and a few visible root nodes.
Wash the cutting thoroughly under running water to remove any soil or fertilizer residue.
Never submerge pothos in a fish tank that has been treated with pesticides or chemical fertilizers.
These substances can kill your fish quickly.
Step 2: Submerge Only the Roots and Stems
Place the cutting so that the roots and about an inch of the stem are underwater.
The leaves must remain above the waterline.
If you submerge pothos in a fish tank with leaves underwater, they will rot and foul the water.
Use a clip, suction cup, or a floating ring to hold the plant in place.
Step 3: Monitor Water Parameters
After you submerge pothos in a fish tank, test the water weekly for nitrates, ammonia, and pH.
The plant will start absorbing nutrients almost immediately.
If nitrate levels drop too fast, your fish might experience stress, so make changes gradually.
Potential Risks of Submerging Pothos in a Fish Tank
Though it’s generally safe, there are a few risks you should know before you submerge pothos in a fish tank.
1. Root Rot from Stagnant Water
If the water in your tank is poorly oxygenated, pothos roots can develop rot.
Submerging pothos in a fish tank without adequate flow may cause the roots to turn brown and mushy.
Use a gentle filter or air stone to keep water moving around the roots.
2. Pests and Hitchhikers
Indoor pothos sometimes carry spider mites or aphids on the leaves.
When you submerge pothos in a fish tank, these pests can fall into the water and harm your fish.
Always inspect the plant carefully and wipe the leaves before placing it near the tank.
3. Toxicity Concerns (Myth vs. Fact)
Pothos contains calcium oxalate crystals, which are toxic if eaten.
But when you submerge pothos in a fish tank, the roots release almost none of those crystals into the water.
Most fish are not interested in eating the tough roots anyway.
However, if you have fish like goldfish that like to nibble everything, monitor them closely.
Best Practices for Keeping Pothos in a Fish Tank Long Term
To make the most of submerging pothos in a fish tank, follow these tips for ongoing success.
Placement Matters
Position the plant near the filter outflow so water constantly flows over the roots.
This prevents dead spots and keeps the roots healthy.
Submerging pothos in a fish tank near the back of the tank also hides the hardware.
Trim Roots Regularly
Pothos roots grow incredibly fast once they get comfortable in the water.
If the roots become a tangled mess, they can clog your filter or overwhelm small fish.
Trim back about one-third of the roots every few weeks.
Provide Bright, Indirect Light
Pothos needs light to grow, but direct sunlight can overheat the tank or cause algae blooms.
Place the tank where it receives bright but filtered light, like near a north or east window.
Submerging pothos in a fish tank under artificial aquarium lights also works well.
So, Can You Submerge Pothos in a Fish Tank?
Yes, you can submerge pothos in a fish tank, and it offers real benefits for water quality and fish health.
Submerging pothos in a fish tank works best when you keep the leaves dry and the roots clean.
The plant will absorb nitrates, provide shade, and require almost no extra work.
Just remember to choose a healthy cutting, avoid pesticides, and monitor your water parameters.
If you follow the steps we covered, submerging pothos in a fish tank is a safe, natural way to improve your aquarium.
Hope this post has helped you understand can you submerge pothos in a fish tank with confidence.