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Subwassertang: The Ultimate Care Guide

Subwassertang: The Ultimate Care Guide

Subwassertang, or Lomariopis lineata, is a very low-maintenance aquatic plant that looks similar to seaweed. This plant is the perfect addition to brighten up your tank’s ecosystem without the constant stress of frequently checking on its state. 

Subwassertang is easy to care for because it doesn’t require CO2, high-level lighting, or strong water flow. Additionally, it clings to surfaces or floats freely around your tank. However, if your subwassertang is not left in ideal conditions, it will become less healthy.

In this article, I’ll go over how to care for subwassertang and maintain optimal conditions for its best growth.

How To Propagate Subwassertang 

Propagating subwassertang is an easy process that only requires you to cut off sizable pieces with scissors or other small shears. Because it is a free-floating plant, the removed subwassertang will flourish by binding to surrounding objects all on its own. 

Subwassertang propagation is similar to propagating other plants like succulents. Once cut, they immediately begin to grow from that area. Propagation is a relatively straightforward process that only requires a few steps.

To easily propagate your subwassertang, all you need to do is:

  1. Select the subwassertang plant that you want to remove a piece from. This plant should be in good health and free of any translucent or squishy leaves. 
  2. Use clean scissors or shears to snip a piece of the plant off gently. 
  3. If moving this portion to a different aquarium tank, rinse or disinfect your plant with diluted bleach.  Here is a YouTube video if you are unsure how to disinfect your plants.

The size of the removed portion does not matter, though smaller pieces will take longer to grow. If you want, you can also soak your cut portion of subwassertang in a separate cup or tank for quarantine before moving it to another tank.

How much of the subwassertang plant you need to cut off for this process depends on the reasons you want to propagate it in the first place. Bigger pieces are better for sharing the subwassertang between tanks, and smaller pieces are suitable for carpeting your tank. 

Propagation for Carpeting

Carpeting is a process where aquatic plants are grown in a way that covers the entire bottom of the tank in a primarily uniform layer. While in many cases carpeting is done with seeds, the process can also be done by propagating specific plants over time.

To create a carpet of subwassertang using propagation, cut smaller pieces from the main subwassertang to cover the entirety of the bottom area of the tank. You can use bigger pieces, though they may take longer to spread out. 

The cut subwassertang will attach itself to the objects you have in the tank. This process is because subwassertang has rhizomes or long root-like strands that expand outward. The plant will grow as long as there is open space and items to grab. 

If you want to speed the carpeting process up, you can place the subwassertang next to the objects around the tank or tie them down. Tying them down ensures that they will not move or cluster in areas outside the intended carpeting area. 

How To Care for Subwassertang 

Subwassertang is one of the easiest aquarium plants to take care of because they don’t require frequent maintenance. They also don’t have the same precise tank conditions that other plants do. 

Water Temperature 

For the best results, subwassertang should be kept in water that is 68-75 degrees Fahrenheit (20-23.9 degrees Celsius). However, if you go slightly below these temperatures by a few degrees, your subwassertang will still thrive. 

Regardless, the temperature you set must remain constant. Subwassertang is a flexible plant, but it takes time to readjust to changing settings. 

Water Hardness and pH Levels 

Setting the correct water hardness and pH levels in your aquarium is essential because they determine the concentration of minerals present. These levels can cause tremendous growth or severe damage if unbalanced.

For optimal growth, place your subwassertang in water with a general hardness of 0 to 8 dGH. Also, make sure that the ph levels are between 6 and 8. This range means that the water is soft and neutral. 


Lighting is essential for any aquarium plant, yet the necessary levels vary from species to species. For subwassertang, low lighting is the best setting. 

While low lighting is the best, be careful not to leave your subwassertang in darkness for too long, as this will result in more damage over time. Additionally, don’t keep your subwassertang under high lighting settings because this will cause your plant to “melt” or turn translucent. 


Subwassertang does not require a heavy flow within the tank to survive and thrive. The strength of the flow should be enough to knock debris, build-up, or dirt off of the pieces. 

Also, the flow should not be so powerful that it causes the plant to rip, break, or detach from its original placement. This will result in damage.

Tank Size

The recommended tank size for growing and maintaining subwassertang is a tank that is no smaller than 8-10 gallons (30-38 liters). Subwassertang is a plant that needs lots of space to grow outward. With too small of a tank, not only could you damage the plant over time, but you can also stall the growth process. 

Does Subwassertang Need CO2? 

Subwassertang does not need CO2 to grow. However, you can add CO2 supplies to promote more growth and stability. This inclusion is not a requirement, though, as the plant gathers all necessary particles by itself.

Problems With Subwassertang

Even though subwassertang is a low-maintenance and stress-free plant, there will still be some issues with its growth. 

It Collects Build Up

It is very common for subwassertang to get dirt and algae built up over time. This excessive debris can significantly alter the aquatic plant’s health if it is not taken care of properly. The build-up may also cause harm or illness to other organisms in the tank. 

Fortunately, this problem can be fixed with a low water flow and tank cleaning on a scheduled routine. By keeping track of the build-up, you can be assured that your subwassertang and tank environment are safe and clean. 

It Might Attach to the Wrong Place

Subwassertang is a free-floating plant that doesn’t require roots to hold it down. Because of this, it can attach anywhere to anything inside the tank. 

While this may be good to increase the overall spread of the plant for decorative and environmental purposes, the subwassertang may connect to something that causes more harm than good. 

In some cases, the subwassertang can grow and attach to filters, pipes, or other necessary equipment inside the tank. The result of this is the subwassertang tangling itself inside the machinery so that it cannot perform necessary functions. 

Even the smallest fragments can float, attach, and get stuck to different areas. To stop this issue from occurring, check your tank frequently and secure any pieces that will not stay down.

It Takes a While To Grow 

Subwassertang will fill up the space you place it in, except it takes a very long time to do so. On average, subwassertang grows only about 4 inches (10 centimeters) annually. 

While this is not a critical issue, it may not be gratifying for those who want a tank full of luscious greenery quickly. 

How Will I Know if My Subwassertang Is Healthy? 

Healthy subwassertang is a bright green color and has a soft texture. It looks and feels very similar to seaweed or lettuce because of how it clumps together. 

If your subwassertang is unhealthy, it will change color, size, and texture significantly. Unhealthy subwassertang plants are brown, translucent, or overly squishy. This issue is called melting.

The plants may also change size or shape. This change is usually from either shrinking or a lack of new growth. 

Typically, these changes are fixable with alternations of the water or lighting. You can also use scissors or shears to clip off the parts of the plant that are unhealthy. In some cases, you may need to replace the whole subwassertang. 

Additionally, organisms like snails or crabs in your tank may leave your subwassertang looking shredded up or thinned out. They tend to overfeed on the subwassertang. If they remain in the tank, they will eat the plant entirely.

How Do I Clean Subwassertang?

There are three easy ways to effectively and safely clean your subwassertang: 

  • Rinse: Use your fingers to rinse the plant under running water carefully. This action is quick but will not remove all parasites or bacteria.
  • Soak: After a quick rinse, let the subwassertang soak in water for a day. 
  • Bleach: Rinse or dip your subwassertang in diluted bleach and water mixture to remove parasites and bacteria. 

It is best to quarantine your subwassertang before adding it to any new or current tank. Subwassertang takes time to adjust to the conditions present in the tank. 

So, it is best to allow it to soak or sit outside to prepare it. In addition, this will provide extra time for all the build-up and parasites to come off of it. 

How Big Does Subwassertang Get? 

Subwassertang grows about 4 inches (10 centimeters) every year. However, there is no maximum amount that it can grow as it will grow to fill the space. 

Subwsertang will grow continuously as long as it is healthy, is not consumed by organisms in the tank, and is given all the proper conditions. However, this can become a problem if the growth is not maintained. Subwassertang is notorious for growing uncontrollably if left unattended.

To remedy any subwassertang overgrowth, all you need to do is ensure that you clip it often. You can keep the clippings for propagation or discard them. The most important thing is to monitor the growth patterns to make sure the subwassertang grows how and where it is supposed to 

How Can I Make Subwassertang Grow Bigger? 

You can make your subwassertang grow bigger by ensuring it has all the right lighting conditions, removing the diseased portions, and adding in extra CO2. This will not make it grow overnight, though it will still speed up the process. 

Checking the Lighting

Making sure the lighting is on the correct setting is crucial for growth because if it is too high, it can cause damage to the plant. Additionally, the subwassertang should not be in direct light either. Checking to ensure the light is in the right setting will ensure that the plant stays in a comfortable environment. 

Removing the Diseased Portions 

Subwassertang is a plant that needs to be occasionally trimmed so healthy pieces can grow where the unhealthy ones were. To do this, cut right below the part of the plant that is damaged or diseased. Discard these as they will not produce more plants through propagation. 

Adding in Extra CO2

Plants of all types have improved significantly from increased CO2 exposure. This result is because CO2 promotes the process of photosynthesis, or the plants’ ability to make their food.

CO2 added to the tank is not a requirement, but it will increase the plant’s growth. However, with increased CO2 comes extra algae that can build up on your subwassertang. 

How Do I Tie Down Subwassertang?

You can tie subwassertang down to the wood, rocks, or other material using 100% cotton string or fishing line. This is not mandatory, but it helps keep the plants in a place where you desire. 

It is recommended you tie your subwassertang to an object that is already inside your aquarium. However, you can add in another time if necessary. Wood and rocks work the best, but plastic tubes also work well. 

Here are the easy steps needed to tie down your subwassertang.

  1. Start by taking your string and wrapping part of it around the object of your choice. 
  2. Tie it in a knot, and wrap the string around the object a few more times. 
  3. Gently spread your subwassertang plant on top of the object. Make sure that it is not all clumped together. 
  4. Using the same piece of string, wrap it around the subwassertang from various angles. You should form a web or net of string all around.
  5. Tuck the string under some of the previously wrapped sections to increase security.
  6. Tie off your subwassertang with a tight knot

If needed, you can repeat the process until the plant is secure. You don’t want to tie your string too tightly because this will constrict the plant. Yet, you don’t want it too loose, so the plant floats free. 

To watch a demonstration on how to tie aquatic plants like subwassertang, check out this video.

Where Can I Buy Subwassertang? 

Subwassertang is commonly purchased at online pet stores, aquarium stores, and some small businesses that specialize in aquarium care. It is not commonly found in everyday pet stores because it is still a newly discovered plant. 

Some individuals grow it themselves in their tanks and sell it. Others gather it in bulk and sell it to those who have larger tanks with more area to cover. 

Is Subwassertang a Type of Moss? 

Subwassertang is not a type of moss, it is instead a type of fern. Additionally, many people mistake it for a kind of seaweed because it is thin and wavy.

What Animals Can Live With Subwassertang? 

Animals that pair well with a tank filled with subwassertang include:

  • Small guppies
  • Goldfish
  • Paradise fish
  • Shrimp

These fish are excellent to keep with subwassertang because while they occasionally feed on it, they will not eat the entire plant. They also will not pull apart or remove the plant from the structures that they are attached to. 

Additionally, subwassertang creates a beneficial environment for all these species. Aside from providing plenty of food, subwassertang also provides adequate areas for these species to lay their eggs on. 

Smaller species like the guppies, shrimp, or goldfish also utilize the subwassertang to hide around. This creates a safe environment for them to hide in or find comfort when stressed, ill, or uncomfortable. 

What Are Some Alternatives to Subwassertang? 

While subwassertang is a unique plant with a particular structure that is hard to replicate, it has a few alternatives. These alternatives are often used when subwassertang is hard to find or out of stock in stores. 

Java Moss

Java moss, also called Taxiphyllum barbieri, is a hair-like green moss. It is one of the most common tank aquatic plants because of its low maintenance and adaptability.

Like subwassertang, java moss has long, thin strands that extend outward. It can also grow into a bush-like structure for individual plant arrangements or carpeting. 

While it does have a similar structure and conditions to subwassertang, java moss does not share the same seaweed-like texture. It clumps together and looks like grass, not like round lettuce or seaweed. 


Liverwort, also known as Marchantiophyta, is a green nonvascular plant. It looks very similar to subwassertang except that it is slightly more compact.

Liverwort’s necessary conditions are almost the same as those for subwassertang. However, this plant requires a slightly more comprehensive temperature range of 40-80 degrees Fahrenheit (4.4-26.6 degrees Celsius). 

Final Thoughts 

Subwassertang is an exceptional plant that requires very little maintenance and care. It doesn’t require any tying, but this may be helpful to prevent it from growing where it shouldn’t. As long as the proper tank conditions are used and the plant is trimmed, it will continue to grow.

I’m Elle, the founder of FishHQ. I created this website to share knowledge, tips, and inspiration for beginner hobbyists to help them create a healthy, happy, and vibrant environment for their fish to thrive. Read more...