Aquarium Plants That Do Not Need Substrate – The Ultimate Guide

Do you ever feel like the messiest part of setting up a new tank is dealing with the soil? Many hobbyists feel intimidated by the idea of managing specialized “active” soils or the cloudiness that comes with dirted tanks.

If you want a stunning, green underwater world without the hassle of heavy gravel or nutrient-rich mud, you are in the right place. You can achieve a professional-looking aquascape using aquarium plants that do not need substrate to thrive.

In this guide, we will explore the best species for bare-bottom tanks, how to attach them to your hardscape, and the secrets to keeping them vibrant through water column feeding. Let’s dive into the world of epiphytes and floaters!

Why Choose Aquarium Plants That Do Not Need Substrate?

For many of us at Aquifarm, the shift toward substrate-free planting was a total game-changer. It opens up a world of design possibilities that traditional rooted plants simply cannot offer.

One of the biggest advantages is the ease of maintenance. When you use aquarium plants that do not need substrate, you can easily vacuum the bottom of the tank to remove fish waste and uneaten food.

This is particularly beneficial for keepers of “messy” fish like Goldfish, Oscars, or Discus. These species produce a high bio-load, and being able to see and remove debris directly from the glass bottom helps maintain pristine water quality.

Versatility in Aquascaping

When your plants aren’t anchored to the floor, your hardscape becomes your canvas. You can move rocks and driftwood around whenever you feel like changing the look of your tank.

Since these plants draw nutrients from the water, they can be placed in the mid-ground, background, or even attached to high points on a branch to create a sense of depth and verticality.

Avoiding “The Big Mess”

Traditional planted tanks often require “capping” soil with sand or gravel. If you ever need to move a plant, you risk pulling up the soil and creating a murky, brown cloud that can stress your fish.

By choosing plants that grow on surfaces, you eliminate this risk entirely. It is a much “cleaner” way to garden underwater, making it perfect for beginners who want to avoid common pitfalls.

The Best Epiphytes for Your Hardscape

Epiphytes are plants that grow on other surfaces—like wood or stones—rather than in the ground. In the wild, they are often found in jungle streams, clinging to fallen trees or rocky outcrops.

Anubias: The Indestructible Classic

If there were a “starter pack” for this hobby, Anubias would be the star. These plants feature thick, waxy green leaves and a horizontal stem called a rhizome.

The most important rule for Anubias is to never bury the rhizome in the sand. If you do, the plant will slowly rot and die. Instead, simply wedge it into a crack in a rock or tie it to a piece of driftwood.

There are many varieties, from the tiny Anubias Nana Petite (perfect for nano tanks) to the large Anubias Barteri. They are slow growers, which means they don’t require constant pruning.

Java Fern (Microsorum pteropus)

Java Fern is another staple that has been loved by aquarists for decades. It is incredibly hardy and can survive in very low-light conditions where other plants might fail.

Like Anubias, Java Fern has a rhizome. You will often see small brown bumps on the underside of the leaves; don’t worry, these aren’t pests! They are spores that will eventually grow into “baby” plants.

Bucephalandra: The Gem of the Aquarium

For those looking for something a bit more exotic, Bucephalandra (or “Buce”) is a must-have. These plants often have a metallic or iridescent sheen on their leaves that looks stunning under high-quality LED lighting.

Bucephalandra species are generally smaller and grow very slowly. They come in dozens of varieties with names like “Godzilla,” “Kedagang,” and “Blue Sky,” offering a huge range of colors from deep green to purple and red.

Floating Plants for Natural Nitrate Control

Floating plants are the “unsung heroes” of the aquarium world. They sit on the surface, soaking up CO2 from the air and nitrates from the water with incredible efficiency.

Using aquarium plants that do not need substrate like floaters is one of the best ways to prevent algae. By shading the tank and out-competing algae for nutrients, they keep your water clear and healthy.

Amazon Frogbit (Limnobium laevigatum)

Frogbit is a favorite because of its long, trailing roots. These roots provide excellent cover for shy fish and a perfect grazing ground for dwarf shrimp.

The leaves look like small lily pads and can grow quite large if given enough nutrients. Just be sure to keep the tops of the leaves dry, as they can rot if they are constantly splashed by a filter.

Red Root Floaters (Phyllanthus fluitans)

If you want a splash of color, Red Root Floaters are breathtaking. Under high light and low nitrate conditions, the entire plant—roots and all—turns a deep, ruby red.

They are slightly more sensitive than Frogbit but provide a visual “pop” that few other surface plants can match. They also produce tiny white flowers when they are particularly happy!

Salvinia Minima

Also known as Water Spangles, this plant has small, fuzzy leaves that repel water. It grows very quickly and is excellent for sucking up excess nutrients in a newly cycled tank.

Mosses and Liverworts: The Versatile Carpeters

You don’t need soil to have a lush “carpet” in your tank. Mosses can be attached to flat rocks or stainless steel mesh to create a green floor that looks just like a meadow.

Java Moss (Taxiphyllum barbieri)

Java Moss is perhaps the most common moss in the hobby. It is nearly impossible to kill and provides a safe haven for fish fry and shrimp.

You can tie it to a piece of wood with some fishing line, and within a few weeks, it will anchor itself and begin to spread. It doesn’t need much light, but it does appreciate a bit of water flow to keep debris from settling in its fronds.

Christmas Moss

Christmas Moss is a bit more decorative than Java Moss. It gets its name because its branches grow downward, resembling the boughs of a fir tree.

It creates a much denser, more “manicured” look. Many aquascapers use it to create “moss trees” by gluing small clumps to the ends of upright pieces of driftwood.

How to Properly Secure Your Plants Without Soil

Since these plants won’t stay down on their own, you need a way to keep them from floating away. Don’t worry—this part is easier than it sounds!

Using Cyanoacrylate Gel (Super Glue)

Yes, you can use super glue! As long as the main ingredient is cyanoacrylate and it is in gel form, it is completely safe for fish and shrimp once cured.

Simply take your plant and your rock/wood out of the water. Dab a small amount of gel onto the rhizome or roots, press it against the surface for 20 seconds, and you’re done. You can put it right back into the tank immediately.

Cotton Thread vs. Fishing Line

If you prefer a more traditional method, you can use thread. Cotton thread is great because it will eventually rot away after the plant has naturally gripped the surface with its roots.

Fishing line is stronger and won’t rot, but it can be harder to hide. If you use fishing line, make sure you don’t tie it so tight that it cuts into the plant’s tissue.

Wedging into Crevices

Sometimes, the best tool is no tool at all. If your driftwood has natural cracks or holes, you can simply “stuff” the roots of an Anubias or Java Fern into the gap.

Just ensure the fit is snug enough that the current won’t blow the plant out. Within a few weeks, the plant will send out “anchor roots” that wrap around the wood like tiny fingers.

Feeding and Maintenance for Substrate-Free Plants

Because aquarium plants that do not need substrate aren’t getting food from the ground, you have to be the one to provide their dinner.

They are “water column feeders,” meaning they absorb everything they need through their leaves and exposed roots. This makes your job fairly straightforward.

The Importance of Liquid Fertilizers

To keep your plants green and growing, you should use a high-quality all-in-one liquid fertilizer. These products contain nitrogen, phosphorus, potassium, and micronutrients like iron.

I usually recommend dosing after your weekly water change. This ensures that the nutrients are replenished and available for the plants to use throughout the week.

Light and CO2 Requirements

Most substrate-free plants are considered “low-tech.” This means they don’t require expensive CO2 injection systems to stay alive.

However, they still need consistent lighting. Aim for 6 to 8 hours of light per day. Using a simple outlet timer is a great way to ensure your plants get a regular “day/night” cycle without you having to remember to flip the switch.

Common Challenges and Troubleshooting

Even the easiest plants can run into trouble. Here is how to handle the most common issues you might face.

Algae Growth on Slow Growers

Because Anubias and Bucephalandra grow slowly, their leaves are prime real estate for spot algae or Black Beard Algae (BBA).

If you see algae starting to form, try reducing your light intensity or the duration the lights are on. Adding “algae eaters” like Nerite Snails or Amano Shrimp can also help keep the leaves clean.

Rhizome Rot

This is the most common cause of death for these plants. It usually happens when the rhizome is buried or if the plant is kept in an area with zero water circulation.

If the rhizome feels mushy or turns brown, use a sharp pair of scissors to trim away the rotting part. The remaining healthy green section can often be saved and will grow back.

Frequently Asked Questions (FAQ)

Can I keep these plants with Goldfish?

Absolutely! In fact, aquarium plants that do not need substrate like Anubias and Java Fern are some of the only plants Goldfish won’t eat. Their leaves are too tough and “bitter” for most fish to snack on.

Do I need a special light for these plants?

Not necessarily. Most will grow under standard LED lights that come with “kit” tanks. However, if you want to see the best colors in Red Root Floaters or Bucephalandra, a full-spectrum aquarium light is recommended.

How do I clean the tank if the plants are everywhere?

That’s the beauty of this setup! If you’ve glued your plants to rocks or wood, you can simply lift the entire piece of hardscape out of the tank, vacuum the glass underneath, and put it back.

Will these plants grow in a tank with sand?

Yes, they will grow in any tank, regardless of what is on the bottom. Just remember: even if you have sand, do not bury the rhizomes of your epiphytes. Let them sit on top of the sand or attach them to a stone.

Can I use these plants in a shrimp tank?

Shrimp love these plants! Mosses, in particular, provide a huge surface area for biofilm to grow, which is the primary food source for baby shrimp.

Conclusion

Creating a beautiful, thriving aquarium doesn’t have to involve messy soils or complicated setups. By utilizing aquarium plants that do not need substrate, you can build a lush environment that is easy to clean, highly flexible, and incredibly beginner-friendly.

Whether you choose the “unkillable” Java Fern, the shimmering Bucephalandra, or the nitrate-busting Amazon Frogbit, these plants offer a shortcut to a successful aquascape.

Remember to feed them through the water column, give them a steady light cycle, and never bury those rhizomes! Happy planting, and we can’t wait to see the beautiful, soil-free worlds you create at home!