How to Outsmart Your Aquatic Plants: Subwassertang “Freshwater Seaweed” Lomariopsis lineata

Subwassertang is a water column floating fern, different from those that float on the water’s surface. It tends to bounce around and clump together, settling on the tank’s bottom and growing upward and outward. This rootless plant cannot be planted, but if you tie it down to wood or rocks, you can shape it into a rounded form, enhancing its visual appeal. Like all plants it will help in the removal of toxins from the water and provide oxygen to the inhabitants. But what separates this apart is that it has a lot of surface area providing space for bio-film to grow, as well as providing many safe haven hiding spots for small shrimp and fry.

Subwassertang is a water column floating fern

In terms of appearance, Subwassertang strongly resembles seaweed, which is reflected in its name. In German, “Subwasser” means “freshwater,” and “tang” means “seaweed,” capturing its essence. The plant features a ribbon-like structure that stretches out in all directions, appearing thin, transparent, and somewhat reminiscent of shredded plastic.

As a water column feeding plant, substrate doesn’t play a crucial role, and although it can thrive in low-light conditions, it tends to propagate more rapidly under medium light levels. High light levels, however, don’t seem to contribute to its thriving in my experience. While the use of CO2 and fertilizers can accelerate its growth and propagation, they are by no means necessary for this plant.

Lomariopsis lineata

Personally, I keep Subwassertang in all my neocaridina tanks and tanks where I breed various lines of bristlenose plecos. Its adaptability and easy care make it a valuable addition to aquariums of all skill levels. So, how do you outsmart Subwassertang? Keep it with tank mates who aren’t big enough to constantly knock it around and disturb it! That’s it! The End!